diff --git a/src/main/java/com/campus/water/entity/Admin.java b/src/main/java/com/campus/water/entity/Admin.java
index 5c0a125..88ef33c 100644
--- a/src/main/java/com/campus/water/entity/Admin.java
+++ b/src/main/java/com/campus/water/entity/Admin.java
@@ -26,7 +26,7 @@ public class Admin {
     private String phone;
 
     // 新增：管理员负责的区域ID（区域管理员专用）
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     // 恢复三个角色枚举
diff --git a/src/main/java/com/campus/water/entity/Alert.java b/src/main/java/com/campus/water/entity/Alert.java
index 43eb7e0..e5afdae 100644
--- a/src/main/java/com/campus/water/entity/Alert.java
+++ b/src/main/java/com/campus/water/entity/Alert.java
@@ -31,7 +31,7 @@ public class Alert {
     @Column(name = "alert_message", columnDefinition = "TEXT")
     private String alertMessage;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Enumerated(EnumType.STRING)
diff --git a/src/main/java/com/campus/water/entity/Device.java b/src/main/java/com/campus/water/entity/Device.java
index 4c38c3e..112d491 100644
--- a/src/main/java/com/campus/water/entity/Device.java
+++ b/src/main/java/com/campus/water/entity/Device.java
@@ -24,7 +24,7 @@ public class Device {
     @Column(name = "device_type", length = 50)
     private DeviceType deviceType;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Column(name = "install_location", length = 200)
diff --git a/src/main/java/com/campus/water/entity/Repairman.java b/src/main/java/com/campus/water/entity/Repairman.java
index fc08920..3633b03 100644
--- a/src/main/java/com/campus/water/entity/Repairman.java
+++ b/src/main/java/com/campus/water/entity/Repairman.java
@@ -25,7 +25,7 @@ public class Repairman {
     @Column(length = 20)
     private String phone;
 
-    @Column(name = "area_id", length = 20)
+    @Column(name = "area_id", length = 36)
     private String areaId;
 
     @Column(name = "skills", length = 200)