diff --git a/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/OmsWorkerVersion.java b/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/OmsWorkerVersion.java
index 122fff8c..c1fc0eb4 100644
--- a/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/OmsWorkerVersion.java
+++ b/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/OmsWorkerVersion.java
@@ -28,10 +28,9 @@ public final class OmsWorkerVersion {
      * @see Package#getImplementationVersion()
      */
     public static String getVersion() {
-        if (StringUtils.isNotEmpty(CACHE)) {
-            return CACHE;
+        if (StringUtils.isEmpty(CACHE)) {
+            CACHE = determineSpringBootVersion();
         }
-        CACHE = determineSpringBootVersion();
         return CACHE;
     }
 
diff --git a/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/utils/SystemInfoUtils.java b/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/utils/SystemInfoUtils.java
index 17643613..d213608d 100644
--- a/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/utils/SystemInfoUtils.java
+++ b/powerjob-worker/src/main/java/com/github/kfcfans/powerjob/worker/common/utils/SystemInfoUtils.java
@@ -47,11 +47,13 @@ public class SystemInfoUtils {
 
     private static void fillMemoryInfo(SystemMetrics metrics) {
         // JVM内存信息(maxMemory指JVM能从操作系统获取的最大内存，即-Xmx参数设置的值，totalMemory指JVM当前持久的总内存)
-        metrics.setJvmMaxMemory(bytes2GB(runtime.maxMemory()));
+        long maxMemory = runtime.maxMemory();
+        long usedMemory = runtime.totalMemory() - runtime.freeMemory();
+        metrics.setJvmMaxMemory(bytes2GB(maxMemory));
         // 已使用内存：当前申请总量 - 当前空余量
-        metrics.setJvmUsedMemory(bytes2GB(runtime.totalMemory() - runtime.freeMemory()));
+        metrics.setJvmUsedMemory(bytes2GB(usedMemory));
         // 已用内存比例
-        metrics.setJvmMemoryUsage(miniDouble(metrics.getJvmUsedMemory() / runtime.maxMemory()));
+        metrics.setJvmMemoryUsage(miniDouble((double) usedMemory / maxMemory));
     }
 
     private static void fillDiskInfo(SystemMetrics metrics) {
diff --git a/powerjob-worker/src/test/java/com/github/kfcfans/powerjob/function/MonitorTest.java b/powerjob-worker/src/test/java/com/github/kfcfans/powerjob/function/MonitorTest.java
index d27390e2..a4aa69f0 100644
--- a/powerjob-worker/src/test/java/com/github/kfcfans/powerjob/function/MonitorTest.java
+++ b/powerjob-worker/src/test/java/com/github/kfcfans/powerjob/function/MonitorTest.java
@@ -52,4 +52,10 @@ public class MonitorTest {
         System.out.println("heap used: " + memoryMXBean.getHeapMemoryUsage());
         System.out.println("noheap used: " + memoryMXBean.getNonHeapMemoryUsage());
     }
+
+    @Test
+    public void testFetchMetrics() {
+        SystemMetrics systemMetrics = SystemInfoUtils.getSystemMetrics();
+        System.out.println(JsonUtils.toJSONString(systemMetrics));
+    }
 }