diff --git a/app/schemas/skill_gap.py b/app/schemas/skill_gap.py
index c7a76e3..20e4e3a 100644
--- a/app/schemas/skill_gap.py
+++ b/app/schemas/skill_gap.py
@@ -4,8 +4,13 @@
 字段命名使用 camelCase alias，与前端 JSON 对齐。
 """
 
+from typing import Literal
+
 from pydantic import BaseModel, Field
 
+# 定制简历可优化模块
+OptimizeModule = Literal["summary", "skills", "experience"]
+
 
 # ===== 请求参数 =====
 
@@ -16,7 +21,7 @@ class SkillGapParam(BaseModel):
 class CustomizeResumeParam(BaseModel):
     job_id: int = Field(..., alias="jobId")
     resume_id: int = Field(..., alias="resumeId")
-    optimize_modules: list[str] = Field(..., alias="optimizeModules")
+    optimize_modules: list[OptimizeModule] = Field(..., alias="optimizeModules")
     add_skills: list[str] = Field(default_factory=list, alias="addSkills")