diff --git a/fund-common/pom.xml b/fund-common/pom.xml
index bb10f7a..d29d030 100644
--- a/fund-common/pom.xml
+++ b/fund-common/pom.xml
@@ -78,6 +78,13 @@
             <scope>provided</scope>
         </dependency>
 
+        <!-- Hutool (雪花ID生成器) -->
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-core</artifactId>
+            <version>5.8.25</version>
+        </dependency>
+
         <!-- Test -->
         <dependency>
             <groupId>org.springframework.boot</groupId>
diff --git a/fund-common/src/main/java/com/fundplatform/common/auth/TokenInfo.java b/fund-common/src/main/java/com/fundplatform/common/auth/TokenInfo.java
index 70c25e4..bc50045 100644
--- a/fund-common/src/main/java/com/fundplatform/common/auth/TokenInfo.java
+++ b/fund-common/src/main/java/com/fundplatform/common/auth/TokenInfo.java
@@ -17,7 +17,7 @@ public class TokenInfo implements Serializable {
     /**
      * 用户ID
      */
-    private Long userId;
+    private String userId;
 
     /**
      * 用户名
@@ -27,7 +27,7 @@ public class TokenInfo implements Serializable {
     /**
      * 租户ID
      */
-    private Long tenantId;
+    private String tenantId;
 
     /**
      * 登录时间戳
@@ -42,7 +42,7 @@ public class TokenInfo implements Serializable {
     public TokenInfo() {
     }
 
-    public TokenInfo(Long userId, String username, Long tenantId, Long expireTime) {
+    public TokenInfo(String userId, String username, String tenantId, Long expireTime) {
         this.userId = userId;
         this.username = username;
         this.tenantId = tenantId;
@@ -50,11 +50,11 @@ public class TokenInfo implements Serializable {
         this.expireTime = expireTime;
     }
 
-    public Long getUserId() {
+    public String getUserId() {
         return userId;
     }
 
-    public void setUserId(Long userId) {
+    public void setUserId(String userId) {
         this.userId = userId;
     }
 
@@ -66,11 +66,11 @@ public class TokenInfo implements Serializable {
         this.username = username;
     }
 
-    public Long getTenantId() {
+    public String getTenantId() {
         return tenantId;
     }
 
-    public void setTenantId(Long tenantId) {
+    public void setTenantId(String tenantId) {
         this.tenantId = tenantId;
     }
 
diff --git a/fund-common/src/main/java/com/fundplatform/common/auth/TokenService.java b/fund-common/src/main/java/com/fundplatform/common/auth/TokenService.java
index 15b86fd..e8458fa 100644
--- a/fund-common/src/main/java/com/fundplatform/common/auth/TokenService.java
+++ b/fund-common/src/main/java/com/fundplatform/common/auth/TokenService.java
@@ -42,7 +42,7 @@ public class TokenService {
      * @param tenantId 租户ID
      * @return Token字符串
      */
-    public String generateToken(Long userId, String username, Long tenantId) {
+    public String generateToken(String userId, String username, String tenantId) {
         return generateToken(userId, username, tenantId, DEFAULT_EXPIRE_SECONDS);
     }
 
@@ -55,7 +55,7 @@ public class TokenService {
      * @param expireSeconds 过期时间（秒）
      * @return Token字符串
      */
-    public String generateToken(Long userId, String username, Long tenantId, long expireSeconds) {
+    public String generateToken(String userId, String username, String tenantId, long expireSeconds) {
         // 生成UUID作为Token
         String token = UUID.randomUUID().toString().replace("-", "");
 
@@ -173,7 +173,7 @@ public class TokenService {
      *
      * @param userId 用户ID
      */
-    public void deleteAllUserTokens(Long userId) {
+    public void deleteAllUserTokens(String userId) {
         String userTokensKey = getUserTokensKey(userId);
         java.util.Map<Object, Object> tokens = redisService.hGetAll(userTokensKey);
 
@@ -225,7 +225,7 @@ public class TokenService {
     /**
      * 构建用户Token列表Key
      */
-    private String getUserTokensKey(Long userId) {
+    private String getUserTokensKey(String userId) {
         return USER_TOKENS_PREFIX + userId;
     }
 }
diff --git a/fund-common/src/main/java/com/fundplatform/common/context/UserContextHolder.java b/fund-common/src/main/java/com/fundplatform/common/context/UserContextHolder.java
index a8d1bae..f19df4f 100644
--- a/fund-common/src/main/java/com/fundplatform/common/context/UserContextHolder.java
+++ b/fund-common/src/main/java/com/fundplatform/common/context/UserContextHolder.java
@@ -5,17 +5,17 @@ package com.fundplatform.common.context;
  */
 public final class UserContextHolder {
 
-    private static final ThreadLocal<Long> USER_ID_HOLDER = new ThreadLocal<>();
+    private static final ThreadLocal<String> USER_ID_HOLDER = new ThreadLocal<>();
     private static final ThreadLocal<String> USER_NAME_HOLDER = new ThreadLocal<>();
 
     private UserContextHolder() {
     }
 
-    public static void setUserId(Long userId) {
+    public static void setUserId(String userId) {
         USER_ID_HOLDER.set(userId);
     }
 
-    public static Long getUserId() {
+    public static String getUserId() {
         return USER_ID_HOLDER.get();
     }
 
diff --git a/fund-common/src/main/java/com/fundplatform/common/core/BaseEntity.java b/fund-common/src/main/java/com/fundplatform/common/core/BaseEntity.java
index 14ba34e..abce9e3 100644
--- a/fund-common/src/main/java/com/fundplatform/common/core/BaseEntity.java
+++ b/fund-common/src/main/java/com/fundplatform/common/core/BaseEntity.java
@@ -8,25 +8,27 @@ import java.time.LocalDateTime;
  *
  * <p>注意：此类不绑定具体 ORM 框架注解（如 JPA、MyBatis-Plus），
  * 仅作为字段规范的统一来源，具体映射由各模块自行扩展。</p>
+ *
+ * <p>主键采用字符串类型（雪花算法生成），解决前端JavaScript大数精度丢失问题。</p>
  */
 public abstract class BaseEntity implements Serializable {
 
     private static final long serialVersionUID = 1L;
 
-    /** 主键ID */
-    private Long id;
+    /** 主键ID（雪花算法生成的19位字符串） */
+    private String id;
 
     /** 租户ID（多租户隔离） */
-    private Long tenantId;
+    private String tenantId;
 
     /** 创建人 */
-    private Long createdBy;
+    private String createdBy;
 
     /** 创建时间 */
     private LocalDateTime createdTime;
 
     /** 更新人 */
-    private Long updatedBy;
+    private String updatedBy;
 
     /** 更新时间 */
     private LocalDateTime updatedTime;
@@ -37,27 +39,27 @@ public abstract class BaseEntity implements Serializable {
     /** 备注 */
     private String remark;
 
-    public Long getId() {
+    public String getId() {
         return id;
     }
 
-    public void setId(Long id) {
+    public void setId(String id) {
         this.id = id;
     }
 
-    public Long getTenantId() {
+    public String getTenantId() {
         return tenantId;
     }
 
-    public void setTenantId(Long tenantId) {
+    public void setTenantId(String tenantId) {
         this.tenantId = tenantId;
     }
 
-    public Long getCreatedBy() {
+    public String getCreatedBy() {
         return createdBy;
     }
 
-    public void setCreatedBy(Long createdBy) {
+    public void setCreatedBy(String createdBy) {
         this.createdBy = createdBy;
     }
 
@@ -69,11 +71,11 @@ public abstract class BaseEntity implements Serializable {
         this.createdTime = createdTime;
     }
 
-    public Long getUpdatedBy() {
+    public String getUpdatedBy() {
         return updatedBy;
     }
 
-    public void setUpdatedBy(Long updatedBy) {
+    public void setUpdatedBy(String updatedBy) {
         this.updatedBy = updatedBy;
     }