diff --git a/oh-my-scheduler-server/pom.xml b/oh-my-scheduler-server/pom.xml
index ad79c368..ffad5f2f 100644
--- a/oh-my-scheduler-server/pom.xml
+++ b/oh-my-scheduler-server/pom.xml
@@ -22,6 +22,7 @@
         <zip4j.version>2.5.2</zip4j.version>
         <jgit.version>5.7.0.202003110725-r</jgit.version>
         <mvn.invoker.version>3.0.1</mvn.invoker.version>
+        <commons.net.version>3.6</commons.net.version>
 
         <!-- 部署时跳过该module -->
         <maven.deploy.skip>true</maven.deploy.skip>
@@ -107,6 +108,13 @@
             <version>${jgit.version}</version>
         </dependency>
 
+        <!-- 时间工具类，NTP时间同步 -->
+        <dependency>
+            <groupId>commons-net</groupId>
+            <artifactId>commons-net</artifactId>
+            <version>${commons.net.version}</version>
+        </dependency>
+
         <!-- Maven Invoker（编译 maven 项目） -->
         <dependency>
             <groupId>org.apache.maven.shared</groupId>
diff --git a/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/akka/OhMyServer.java b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/akka/OhMyServer.java
index 02a1cb21..6e4c1054 100644
--- a/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/akka/OhMyServer.java
+++ b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/akka/OhMyServer.java
@@ -8,6 +8,7 @@ import com.github.kfcfans.oms.common.utils.NetUtils;
 import com.github.kfcfans.oms.server.akka.actors.FriendActor;
 import com.github.kfcfans.oms.server.akka.actors.ServerActor;
 import com.github.kfcfans.oms.server.common.utils.PropertyUtils;
+import com.github.kfcfans.oms.server.common.utils.TimeUtils;
 import com.google.common.base.Stopwatch;
 import com.google.common.collect.Maps;
 import com.typesafe.config.Config;
@@ -38,6 +39,8 @@ public class OhMyServer {
         Stopwatch stopwatch = Stopwatch.createStarted();
         log.info("[OhMyServer] OhMyServer's akka system start to bootstrap...");
 
+        TimeUtils.check();
+
         // 解析配置文件
         PropertyUtils.init();
         Properties properties = PropertyUtils.getProperties();
diff --git a/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/common/utils/TimeUtils.java b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/common/utils/TimeUtils.java
new file mode 100644
index 00000000..67ac5ca2
--- /dev/null
+++ b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/common/utils/TimeUtils.java
@@ -0,0 +1,63 @@
+package com.github.kfcfans.oms.server.common.utils;
+
+import com.github.kfcfans.oms.common.RemoteConstant;
+import com.google.common.collect.Lists;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.net.ntp.NTPUDPClient;
+import org.apache.commons.net.ntp.NtpV3Packet;
+import org.apache.commons.net.ntp.TimeInfo;
+
+import java.net.InetAddress;
+import java.util.List;
+
+/**
+ * 时间工具
+ *
+ * @author tjq
+ * @since 2020/5/19
+ */
+@Slf4j
+public class TimeUtils {
+
+    // NTP 授时服务器（阿里云 -> 交大 -> 水果）
+    private static final List<String> NTP_SERVER_LIST = Lists.newArrayList("ntp.aliyun.com", "ntp.sjtu.edu.cn", "time1.apple.com");
+    // 最大误差 5S
+    private static final long MAX_OFFSET = 5000;
+
+    public static void check() throws TimeCheckException {
+
+        NTPUDPClient timeClient = new NTPUDPClient();
+        timeClient.setDefaultTimeout((int) RemoteConstant.DEFAULT_TIMEOUT_MS);
+
+        for (String address : NTP_SERVER_LIST) {
+            try {
+                TimeInfo t = timeClient.getTime(InetAddress.getByName(address));
+                NtpV3Packet ntpV3Packet = t.getMessage();
+                log.info("[TimeUtils] use ntp server: {}, request result: {}", address, ntpV3Packet);
+                // RFC-1305标准：https://tools.ietf.org/html/rfc1305
+                // 忽略传输误差吧...也就几十毫秒的事（阿里云给力啊！）
+                long local = System.currentTimeMillis();
+                long ntp = ntpV3Packet.getTransmitTimeStamp().getTime();
+                long offset =  local - ntp;
+                if (Math.abs(offset) > MAX_OFFSET) {
+                    String msg = String.format("inaccurate server time(local:%d, ntp:%d), please use ntp update to calibration time", local, ntp);
+                    throw new TimeCheckException(msg);
+                }
+                return;
+            }catch (Exception ignore) {
+                log.warn("[TimeUtils] ntp server: {} may down!", address);
+            }
+        }
+
+        throw new TimeCheckException("no available ntp server, maybe alibaba, sjtu and apple are both collapse");
+    }
+
+    public static final class TimeCheckException extends RuntimeException {
+        public TimeCheckException(String message) {
+            super(message);
+        }
+        public TimeCheckException(Throwable cause) {
+            super(cause);
+        }
+    }
+}
diff --git a/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/service/ContainerService.java b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/service/ContainerService.java
index f3bdf4f6..896ba4dc 100644
--- a/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/service/ContainerService.java
+++ b/oh-my-scheduler-server/src/main/java/com/github/kfcfans/oms/server/service/ContainerService.java
@@ -151,7 +151,9 @@ public class ContainerService {
             // 将文件拷贝到正确的路径
             String finalFileStr = OmsFileUtils.genContainerJarPath() + fileName;
             File finalFile = new File(finalFileStr);
-            FileUtils.forceDelete(finalFile);
+            if (finalFile.exists()) {
+                FileUtils.forceDelete(finalFile);
+            }
             FileUtils.moveFile(tmpFile, finalFile);
 
             return md5;
diff --git a/oh-my-scheduler-worker/src/main/java/com/github/kfcfans/oms/worker/common/utils/SerializerUtils.java b/oh-my-scheduler-worker/src/main/java/com/github/kfcfans/oms/worker/common/utils/SerializerUtils.java
index 99248566..3bb982fb 100644
--- a/oh-my-scheduler-worker/src/main/java/com/github/kfcfans/oms/worker/common/utils/SerializerUtils.java
+++ b/oh-my-scheduler-worker/src/main/java/com/github/kfcfans/oms/worker/common/utils/SerializerUtils.java
@@ -4,7 +4,6 @@ package com.github.kfcfans.oms.worker.common.utils;
 import com.esotericsoftware.kryo.Kryo;
 import com.esotericsoftware.kryo.io.Input;
 import com.esotericsoftware.kryo.io.Output;
-import com.esotericsoftware.kryo.util.Pool;
 
 /**
  * 序列化器