diff --git a/Assets/Prefabs/CardTags/Infantry.asset.meta b/Assets/Prefabs/Ability.meta
similarity index 52%
rename from Assets/Prefabs/CardTags/Infantry.asset.meta
rename to Assets/Prefabs/Ability.meta
index 944d785..217f7cc 100644
--- a/Assets/Prefabs/CardTags/Infantry.asset.meta
+++ b/Assets/Prefabs/Ability.meta
@@ -1,8 +1,8 @@
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diff --git a/Assets/Prefabs/CardTags/Archer.asset.meta b/Assets/Prefabs/CardClasses.meta
similarity index 52%
rename from Assets/Prefabs/CardTags/Archer.asset.meta
rename to Assets/Prefabs/CardClasses.meta
index 6a1b5da..1fe41d1 100644
--- a/Assets/Prefabs/CardTags/Archer.asset.meta
+++ b/Assets/Prefabs/CardClasses.meta
@@ -1,8 +1,8 @@
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-guid: 099176a69eb9a6d408b4d4dba5232c84
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diff --git a/Assets/Prefabs/CardClasses/ArcherClass.cs b/Assets/Prefabs/CardClasses/ArcherClass.cs
new file mode 100644
index 0000000..0a5cf9b
--- /dev/null
+++ b/Assets/Prefabs/CardClasses/ArcherClass.cs
@@ -0,0 +1,14 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "ArcherClass", menuName = "Card Class/Archer Class Data")]
+public class ArcherClass : UnitClass
+{
+    public int extraAttackRange = 2;
+    public override void ApplyClassSpecilization(Unit unit)
+    {
+        unit.MeleeAttackRange = 0;
+        unit.RangedAttackRange += extraAttackRange;
+    }
+}
diff --git a/Assets/Prefabs/CardClasses/ArcherClass.cs.meta b/Assets/Prefabs/CardClasses/ArcherClass.cs.meta
new file mode 100644
index 0000000..0100b07
--- /dev/null
+++ b/Assets/Prefabs/CardClasses/ArcherClass.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 1bc96940f74c4ce4581f5cdec90d1e0b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
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diff --git a/Assets/Prefabs/CardClasses/CavalryClass.cs b/Assets/Prefabs/CardClasses/CavalryClass.cs
new file mode 100644
index 0000000..f31f089
--- /dev/null
+++ b/Assets/Prefabs/CardClasses/CavalryClass.cs
@@ -0,0 +1,13 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "CavalryClass", menuName = "Card Class/Cavalry Class Data")]
+public class CavalryClass : UnitClass
+{
+    public int extraMovement = 1;
+    public override void ApplyClassSpecilization(Unit unit)
+    {
+        unit.Movement += extraMovement;
+    }
+}
diff --git a/Assets/Prefabs/CardClasses/CavalryClass.cs.meta b/Assets/Prefabs/CardClasses/CavalryClass.cs.meta
new file mode 100644
index 0000000..da10ce0
--- /dev/null
+++ b/Assets/Prefabs/CardClasses/CavalryClass.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: e099c37da90ac1b46ac0a5ee6f79f507
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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diff --git a/Assets/Prefabs/CardDatas/官军弓兵.asset b/Assets/Prefabs/CardDatas/官军弓兵.asset
index 6b5afb9..123f412 100644
--- a/Assets/Prefabs/CardDatas/官军弓兵.asset
+++ b/Assets/Prefabs/CardDatas/官军弓兵.asset
@@ -18,6 +18,5 @@ MonoBehaviour:
   cost: 1
   attack: 5
   defense: 10
-  movement: 1
   cardTags:
   - {fileID: 11400000, guid: 099176a69eb9a6d408b4d4dba5232c84, type: 2}
diff --git a/Assets/Prefabs/CardDatas/黄巾弓兵.asset b/Assets/Prefabs/CardDatas/黄巾弓兵.asset
index 0c25f6b..bb13c1e 100644
--- a/Assets/Prefabs/CardDatas/黄巾弓兵.asset
+++ b/Assets/Prefabs/CardDatas/黄巾弓兵.asset
@@ -18,6 +18,5 @@ MonoBehaviour:
   cost: 1
   attack: 5
   defense: 10
-  movement: 1
   cardTags:
   - {fileID: 11400000, guid: 099176a69eb9a6d408b4d4dba5232c84, type: 2}
diff --git a/Assets/Prefabs/CardTags.meta b/Assets/Prefabs/CardTags.meta
index 1fe41d1..122bd91 100644
--- a/Assets/Prefabs/CardTags.meta
+++ b/Assets/Prefabs/CardTags.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 29138ff75042d784e83244ddb11034ed
+guid: d079f30f575342145b9a2e5b0204e326
 folderAsset: yes
 DefaultImporter:
   externalObjects: {}
diff --git a/Assets/Prefabs/CardTags/Archer.asset b/Assets/Prefabs/CardTags/Archer.asset
deleted file mode 100644
index 1430a17..0000000
--- a/Assets/Prefabs/CardTags/Archer.asset
+++ /dev/null
@@ -1,17 +0,0 @@
-%YAML 1.1
-%TAG !u! tag:unity3d.com,2011:
---- !u!114 &11400000
-MonoBehaviour:
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-  m_Script: {fileID: 11500000, guid: c090164f177918042b3be10f378e9b5f, type: 3}
-  m_Name: Archer
-  m_EditorClassIdentifier: 
-  name: Archer
-  description: 
-  artwork: {fileID: 0}
diff --git a/Assets/Prefabs/CardTags/Cavalry.asset b/Assets/Prefabs/CardTags/Cavalry.asset
deleted file mode 100644
index 6f4800a..0000000
--- a/Assets/Prefabs/CardTags/Cavalry.asset
+++ /dev/null
@@ -1,17 +0,0 @@
-%YAML 1.1
-%TAG !u! tag:unity3d.com,2011:
---- !u!114 &11400000
-MonoBehaviour:
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-  m_Script: {fileID: 11500000, guid: c090164f177918042b3be10f378e9b5f, type: 3}
-  m_Name: Cavalry
-  m_EditorClassIdentifier: 
-  name: Cavalry
-  description: 
-  artwork: {fileID: 0}
diff --git a/Assets/Prefabs/CardTags/Cavalry.asset.meta b/Assets/Prefabs/CardTags/Cavalry.asset.meta
deleted file mode 100644
index 1ac03ac..0000000
--- a/Assets/Prefabs/CardTags/Cavalry.asset.meta
+++ /dev/null
@@ -1,8 +0,0 @@
-fileFormatVersion: 2
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diff --git a/Assets/Prefabs/CardTags/Infantry.asset b/Assets/Prefabs/CardTags/Infantry.asset
deleted file mode 100644
index 4b3fd70..0000000
--- a/Assets/Prefabs/CardTags/Infantry.asset
+++ /dev/null
@@ -1,17 +0,0 @@
-%YAML 1.1
-%TAG !u! tag:unity3d.com,2011:
---- !u!114 &11400000
-MonoBehaviour:
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-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: c090164f177918042b3be10f378e9b5f, type: 3}
-  m_Name: Infantry
-  m_EditorClassIdentifier: 
-  name: Infantry
-  description: 
-  artwork: {fileID: 0}
diff --git a/Assets/Scripts/Ability.cs b/Assets/Scripts/Ability.cs
new file mode 100644
index 0000000..96a3f95
--- /dev/null
+++ b/Assets/Scripts/Ability.cs
@@ -0,0 +1,41 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Ability : ScriptableObject
+{
+    public new string name;
+    public string description;
+
+    public virtual void OnSpawn(Unit unit) { }
+    public virtual void OnBeginRound(Unit unit) { }
+    public virtual void OnEndRound(Unit unit) { }
+    
+    public virtual void OnBeginMove(Unit unit) { }
+    public virtual void OnMove(Unit unit, int travelDistance) { }
+    public virtual void OnEndMove(Unit unit) { }
+    
+    public virtual void OnBeginAttackPhrase(Unit unit) { }
+    public virtual void OnBeginAttack(Unit unit, List<Unit> targets) { }
+    public virtual void OnAttack(Unit unit, List<Unit> targets) { }
+    public virtual void OnEndAttack(Unit unit, List<Unit> targets) { }
+    public virtual void OnEndAttackPhrase(Unit unit) { }
+    public virtual void OnExecute(Unit unit, Unit target) { }
+    public virtual void OnAllyDeath(Unit unit) { }
+    public virtual void OnEnemyDeath(Unit unit) { }
+    public virtual void OnAnyDeath(Unit unit) { }
+
+    public virtual void OnCounterAttack(Unit unit, Unit attacker) { }
+    public virtual void OnDamaged(Unit unit, Unit attacker) { }
+    public virtual void OnArmorBreak(Unit unit, Unit attacker) { }
+    public virtual void OnDefeat(Unit unit, Unit attacker) { }
+
+    public virtual void OnEnterBattleGround(Unit unit) { }
+    public virtual void OnExitBattleGround(Unit unit) { }
+    public virtual void OnDraw(Unit unit) { }
+    public virtual void OnRecovered(Unit unit, Unit helper) { }
+    public virtual void OnEquippingArmor(Unit unit, int armorAmount) { }
+    public virtual void OnDiscard(Unit unit) { }
+
+    public virtual void OnCasting(Unit unit) { }
+}
diff --git a/Assets/Scripts/Ability.cs.meta b/Assets/Scripts/Ability.cs.meta
new file mode 100644
index 0000000..0efed3a
--- /dev/null
+++ b/Assets/Scripts/Ability.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 27a2e411b169b994891c431e7a183368
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/CardData.cs b/Assets/Scripts/CardData.cs
index ac8d86a..ead64dc 100644
--- a/Assets/Scripts/CardData.cs
+++ b/Assets/Scripts/CardData.cs
@@ -2,7 +2,6 @@ using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
-[CreateAssetMenu(fileName = "New Card Data", menuName = "Card/Card Data")]
 public class CardData : ScriptableObject
 {
     public new string name;
@@ -14,5 +13,7 @@ public class CardData : ScriptableObject
     public int attack;
     public int defense;
 
-    public CardTag[] cardTags;
+    public CardTag[] tags;
+    public UnitClass[] unitClasses;
+    public Ability[] abilities;
 }
diff --git a/Assets/Scripts/CardTag.cs b/Assets/Scripts/CardTag.cs
index aa7404d..bb7e175 100644
--- a/Assets/Scripts/CardTag.cs
+++ b/Assets/Scripts/CardTag.cs
@@ -7,6 +7,4 @@ public class CardTag : ScriptableObject
 {
     public new string name;
     public string description;
-
-    public Sprite artwork;
 }
diff --git a/Assets/Scripts/CellMap.cs b/Assets/Scripts/CellMap.cs
index fac2ee8..2f0b633 100644
--- a/Assets/Scripts/CellMap.cs
+++ b/Assets/Scripts/CellMap.cs
@@ -15,7 +15,6 @@ public class CellMap : MonoBehaviour
     public int column = 0;
     public int row = 0;
 
-
     // Start is called before the first frame update
     void Start()
     {
@@ -35,11 +34,16 @@ public class CellMap : MonoBehaviour
     // Update is called once per frame
     void Update()
     {
-        
+
     }
 
     public Cell GetCell(int x, int y)
     {
         return cellMapData[y].cells[x];
     }
+
+    public bool IsCellEmpty(int x, int y)
+    {
+        return GetCell(x, y).standingUnit == null;
+    }
 }
diff --git a/Assets/Scripts/Unit.cs b/Assets/Scripts/Unit.cs
index 351dab3..a76bc6b 100644
--- a/Assets/Scripts/Unit.cs
+++ b/Assets/Scripts/Unit.cs
@@ -13,7 +13,7 @@ public enum Side { left = 1, right = -1 }
 public class Unit : MonoBehaviour
 {
     public string unitName;
-    public CardData cardData;
+    public CardData baseData;
 
     [SerializeField]
     private int basicAttack;
@@ -27,12 +27,37 @@ public class Unit : MonoBehaviour
     private int finalMaxDefense;
 
     [SerializeField]
-    private CardTag[] cardTags;
+    private List<CardTag> cardTags;
 
     [SerializeField]
-    private int attackRange = 1;
+    private List<UnitClass> unitClasses;
+
+    [SerializeField]
+    private List<Ability> abilities;
+
+    [SerializeField]
+    private int meleeAttackRange = 1;
+    public int MeleeAttackRange
+    {
+        get { return meleeAttackRange; }
+        set { meleeAttackRange = value; }
+    }
+
+    [SerializeField]
+    private int rangedAttackRange = 1;
+    public int RangedAttackRange
+    {
+        get { return rangedAttackRange; }
+        set { rangedAttackRange = value; }
+    }
+
     [SerializeField]
     private int movement = 1;
+    public int Movement
+    {
+        get { return movement; }
+        set { movement = value; }
+    }
 
     [SerializeField]
     private CurrentCommand currentCommand;
@@ -53,6 +78,11 @@ public class Unit : MonoBehaviour
     Camp allyCamp;
     Camp enemyCamp;
 
+    public bool isUnitAlive()
+    {
+        return currentDefense > 0;
+    }
+
     // Start is called before the first frame update
     void Start()
     {
@@ -61,24 +91,18 @@ public class Unit : MonoBehaviour
         transform.position = new Vector3(transform.position.x, transform.position.y, -1);
         standingCell.standingUnit = this;
 
-        basicAttack = cardData.attack;
-        basicMaxDefense = cardData.defense;
+        basicAttack = baseData.attack;
+        basicMaxDefense = baseData.defense;
         currentDefense = basicMaxDefense;
-        cardTags = cardData.cardTags;
+        cardTags = baseData.tags.ToList();
+        unitClasses = baseData.unitClasses.ToList();
 
-        foreach (var tag in cardData.cardTags)
+        foreach (var unitClass in unitClasses)
         {
-            if (tag.name == "Archer")
-            {
-                attackRange += 2;
-            }
-            else if (tag.name == "Cavalry")
-            {
-                movement += 1;
-            }
+            unitClass.ApplyClassSpecilization(this);
         }
 
-        modelArt.GetComponent<SpriteRenderer>().sprite = cardData.artwork;
+        modelArt.GetComponent<SpriteRenderer>().sprite = baseData.artwork;
 
         var camps = FindObjectsOfType<Camp>();
         foreach (var camp  in camps)
@@ -94,8 +118,7 @@ public class Unit : MonoBehaviour
         }
     }
 
-    // Update is called once per frame
-    void Update()
+    void UpdateAnimation()
     {
         if (walkingToDestination && destinationCell && transform.position != destinationCell.transform.position)
         {
@@ -114,13 +137,22 @@ public class Unit : MonoBehaviour
                 //Debug.Log("Arrived.");
             }
         }
+    }
 
-        finalAttack = basicAttack; // For now.
-
+    void UpdateText()
+    {
         attackText.GetComponent<TextMeshProUGUI>().text = finalAttack.ToString();
         defenseText.GetComponent<TextMeshProUGUI>().text = currentDefense.ToString();
     }
 
+    // Update is called once per frame
+    void Update()
+    {
+        UpdateAnimation();
+        finalAttack = basicAttack; // For now.
+        UpdateText();
+    }
+
     public void MoveAndAttack()
     {
         MoveAction();
@@ -133,11 +165,11 @@ public class Unit : MonoBehaviour
         {
             return;
         }
-        foreach (var tag in cardData.cardTags)
+        foreach (var tag in cardTags)
         {
             if (tag.name == "Archer")
             {
-                for (int i = 0; i < attackRange; ++i)
+                for (int i = 0; i < meleeAttackRange; ++i)
                 {
                     int attackXPos = standingCell.xPos + (i + 1) * (int)side;
                     if (attackXPos >= cellMap.column || attackXPos < 0)
@@ -236,7 +268,7 @@ public class Unit : MonoBehaviour
         // Check Attack Range
         if (inDogFight(this))
         {
-            foreach (var tag in cardData.cardTags)
+            foreach (var tag in cardTags)
             {
                 if (tag.name == "Archer")
                 {
@@ -247,7 +279,7 @@ public class Unit : MonoBehaviour
         }
 
         List<Unit> unitsInRange = new List<Unit>();
-        for (int i = 0; i < attackRange; ++i)
+        for (int i = 0; i < meleeAttackRange; ++i)
         {
             int attackXPos = standingCell.xPos + (i+1) * (int)side;
             if (attackXPos >= cellMap.column || attackXPos < 0)
@@ -307,11 +339,6 @@ public class Unit : MonoBehaviour
         }
     }
 
-    public bool isUnitAlive()
-    {
-        return currentDefense > 0;
-    }
-
     bool checkDestinationCellEmpty(bool retreat = false)
     {
         int currentXPos = standingCell.xPos;
diff --git a/Assets/Scripts/UnitClass.cs b/Assets/Scripts/UnitClass.cs
new file mode 100644
index 0000000..641ecbb
--- /dev/null
+++ b/Assets/Scripts/UnitClass.cs
@@ -0,0 +1,12 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class UnitClass : ScriptableObject
+{
+    public new string name;
+    public string description;
+
+    public Sprite artwork;
+    public virtual void ApplyClassSpecilization(Unit unit) { }
+}
diff --git a/Assets/Scripts/UnitClass.cs.meta b/Assets/Scripts/UnitClass.cs.meta
new file mode 100644
index 0000000..f0cae10
--- /dev/null
+++ b/Assets/Scripts/UnitClass.cs.meta
@@ -0,0 +1,11 @@
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+guid: 7d6c417b0c9236b4a915f410e56db822
+MonoImporter:
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+  executionOrder: 0
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