diff --git a/assembly/assembly.xml b/assembly/assembly.xml
index d187ce0..e80a788 100644
--- a/assembly/assembly.xml
+++ b/assembly/assembly.xml
@@ -48,13 +48,13 @@
         </fileSet>
     </fileSets>
     
-    <dependencySets>
-        <!-- lib目录 - 所有依赖JAR -->
-        <dependencySet>
-            <outputDirectory>lib</outputDirectory>
-            <useProjectArtifact>true</useProjectArtifact>
-            <scope>runtime</scope>
+    <!-- 主JAR文件放到根目录（Spring Boot fat jar已包含所有依赖） -->
+    <files>
+        <file>
+            <source>${project.build.directory}/${project.artifactId}.jar</source>
+            <outputDirectory>/</outputDirectory>
+            <destName>${project.artifactId}.jar</destName>
             <fileMode>0644</fileMode>
-        </dependencySet>
-    </dependencySets>
+        </file>
+    </files>
 </assembly>
diff --git a/scripts/start.sh b/scripts/start.sh
index 3f24efa..776f8f3 100755
--- a/scripts/start.sh
+++ b/scripts/start.sh
@@ -36,10 +36,22 @@ if [[ -z "${INSTANCE_NAME}" ]] || [[ "${INSTANCE_NAME}" == '\${APP_NAME}' ]]; th
 fi
 TENANT_ID=${TENANT_ID:-""}
 
-# 4. JAR文件路径
-JAR_FILE=$(ls ${APP_HOME}/lib/*.jar 2>/dev/null | head -1)
-if [ -z "$JAR_FILE" ]; then
-    echo "Error: No JAR file found in ${APP_HOME}/lib/"
+# 4. JAR文件路径（优先查找根目录的主JAR，再查找lib目录）
+# Spring Boot fat jar已包含所有依赖，主JAR在根目录
+JAR_FILE="${APP_HOME}/${APP_NAME}.jar"
+if [ ! -f "$JAR_FILE" ]; then
+    # fallback: 查找lib目录（兼容旧版打包结构）
+    JAR_FILE=$(ls ${APP_HOME}/lib/${APP_NAME}*.jar 2>/dev/null | head -1)
+fi
+if [ ! -f "$JAR_FILE" ]; then
+    # 最后尝试: lib目录任意jar（向后兼容）
+    JAR_FILE=$(ls ${APP_HOME}/lib/*.jar 2>/dev/null | head -1)
+fi
+if [ -z "$JAR_FILE" ] || [ ! -f "$JAR_FILE" ]; then
+    echo "Error: No JAR file found for ${APP_NAME}"
+    echo "  Searched: ${APP_HOME}/${APP_NAME}.jar"
+    echo "  Searched: ${APP_HOME}/lib/${APP_NAME}*.jar"
+    echo "  Searched: ${APP_HOME}/lib/*.jar"
     exit 1
 fi
 
@@ -85,6 +97,7 @@ echo "Starting ${INSTANCE_NAME}..."
 echo "  APP_NAME: ${APP_NAME}"
 echo "  INSTANCE_NAME: ${INSTANCE_NAME}"
 echo "  APP_HOME: ${APP_HOME}"
+echo "  JAR_FILE: ${JAR_FILE}"
 echo "  LOG_HOME: ${LOG_HOME}"
 echo "  JAVA_OPTS: ${JAVA_OPTS}"
 if [ -n "${TENANT_ID}" ]; then