diff --git a/src/abilities/base.ts b/src/abilities/base.ts
new file mode 100644
index 000000000..7117cfe6a
--- /dev/null
+++ b/src/abilities/base.ts
@@ -0,0 +1,124 @@
+// Modular Abilities System
+// 重构单位技能系统，使用面向对象设计
+
+enum AbilityType {
+    PASSIVE = 'passive',      // 第一技能：被动
+    BASIC = 'basic',          // 第二技能：基础攻击
+    SPECIAL = 'special',      // 第三技能：特殊技能
+    ULTIMATE = 'ultimate'     // 第四技能：终极技能
+}
+
+interface AbilityConfig {
+    type: AbilityType;
+    name: string;
+    description: string;
+    cooldown: number;
+    energyCost: number;
+    range: number;
+    conditions?: AbilityCondition[];
+    effects?: AbilityEffect[];
+}
+
+interface AbilityCondition {
+    type: 'health' | 'mana' | 'distance' | 'status';
+    operator: '<' | '>' | '=' | '<=' | '>=';
+    value: number;
+}
+
+interface AbilityEffect {
+    type: 'damage' | 'heal' | 'buff' | 'debuff' | 'summon';
+    value: number;
+    duration?: number;
+}
+
+abstract class Ability {
+    protected config: AbilityConfig;
+    protected currentCooldown: number = 0;
+
+    constructor(config: AbilityConfig) {
+        this.config = config;
+    }
+
+    get type(): AbilityType {
+        return this.config.type;
+    }
+
+    get name(): string {
+        return this.config.name;
+    }
+
+    canUse(context: AbilityContext): boolean {
+        // 检查冷却
+        if (this.currentCooldown > 0) return false;
+
+        // 检查能量
+        if (context.energy < this.config.energyCost) return false;
+
+        // 检查距离
+        if (context.distance > this.config.range) return false;
+
+        // 检查条件
+        if (this.config.conditions) {
+            for (const cond of this.config.conditions) {
+                if (!this.checkCondition(cond, context)) return false;
+            }
+        }
+
+        return true;
+    }
+
+    execute(context: AbilityContext): AbilityResult {
+        if (!this.canUse(context)) {
+            return { success: false, reason: 'Cannot use ability' };
+        }
+
+        // 执行效果
+        const results = this.config.effects?.map(effect => this.applyEffect(effect, context)) || [];
+
+        // 设置冷却
+        this.currentCooldown = this.config.cooldown;
+
+        return { success: true, effects: results };
+    }
+
+    reduceCooldown(amount: number = 1): void {
+        this.currentCooldown = Math.max(0, this.currentCooldown - amount);
+    }
+
+    protected checkCondition(condition: AbilityCondition, context: AbilityContext): boolean {
+        const value = context[condition.type] || 0;
+        switch (condition.operator) {
+            case '<': return value < condition.value;
+            case '>': return value > condition.value;
+            case '=': return value === condition.value;
+            case '<=': return value <= condition.value;
+            case '>=': return value >= condition.value;
+            default: return false;
+        }
+    }
+
+    protected abstract applyEffect(effect: AbilityEffect, context: AbilityContext): EffectResult;
+}
+
+interface AbilityContext {
+    energy: number;
+    health: number;
+    distance: number;
+    status: string;
+    source: any;
+    target: any;
+}
+
+interface AbilityResult {
+    success: boolean;
+    reason?: string;
+    effects?: EffectResult[];
+}
+
+interface EffectResult {
+    type: string;
+    value: number;
+    duration?: number;
+}
+
+export { Ability, AbilityType, AbilityConfig };