diff --git a/src/main/java/com/yunhai/bschclassmanage/controller/api/SchHistoryController.java b/src/main/java/com/yunhai/bschclassmanage/controller/api/SchHistoryController.java
index b9f7bdb..5718c4a 100644
--- a/src/main/java/com/yunhai/bschclassmanage/controller/api/SchHistoryController.java
+++ b/src/main/java/com/yunhai/bschclassmanage/controller/api/SchHistoryController.java
@@ -10,8 +10,10 @@ import com.yunhai.bschclassmanage.service.IStudentClassHistoryService;
 import com.yunhai.bschclassmanage.utils.UserContext;
 import com.yunhai.platform.utils.exception.DException;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.*;
 
+import java.beans.PropertyEditorSupport;
 import java.util.List;
 import java.util.Map;
 
@@ -24,6 +26,25 @@ public class SchHistoryController {
     @Autowired
     private IStudentClassHistoryService studentClassHistoryService;  // 使用接口
 
+    /**
+     * 将 Integer 参数收到的 "null"/空串 统一当作 null，使方法内能进入并触发业务校验，
+     * 而不是在 Spring 类型转换阶段直接抛 MethodArgumentTypeMismatchException。
+     */
+    @InitBinder
+    public void initBinder(WebDataBinder binder) {
+        binder.registerCustomEditor(Integer.class, new PropertyEditorSupport() {
+            @Override
+            public void setAsText(String text) {
+                String t = (text == null) ? null : text.trim();
+                if (t == null || t.isEmpty() || "null".equalsIgnoreCase(t)) {
+                    setValue(null);
+                } else {
+                    setValue(Integer.valueOf(t));
+                }
+            }
+        });
+    }
+
     @GetMapping("getClass")
     public HistorySchClassVO GetClassFirst(Integer classId) {
         if (classId == null || classId <= 0) {