diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/JobService.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/JobService.java
index 9b8a874c..9ae00a1c 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/JobService.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/JobService.java
@@ -1,6 +1,7 @@
 package com.github.kfcfans.powerjob.server.service;
 
 import com.github.kfcfans.powerjob.common.InstanceStatus;
+import com.github.kfcfans.powerjob.common.PowerJobException;
 import com.github.kfcfans.powerjob.common.TimeExpressionType;
 import com.github.kfcfans.powerjob.common.request.http.SaveJobInfoRequest;
 import com.github.kfcfans.powerjob.common.response.JobInfoDTO;
@@ -78,7 +79,7 @@ public class JobService {
             jobInfoDO.setNotifyUserIds(SJ.commaJoiner.join(request.getNotifyUserIds()));
         }
 
-        refreshJob(jobInfoDO);
+        calculateNextTriggerTime(jobInfoDO);
         if (request.getId() == null) {
             jobInfoDO.setGmtCreate(new Date());
         }
@@ -143,7 +144,7 @@ public class JobService {
         JobInfoDO jobInfoDO = jobInfoRepository.findById(jobId).orElseThrow(() -> new IllegalArgumentException("can't find job by jobId:" + jobId));
 
         jobInfoDO.setStatus(SwitchableStatus.ENABLE.getV());
-        refreshJob(jobInfoDO);
+        calculateNextTriggerTime(jobInfoDO);
 
         jobInfoRepository.saveAndFlush(jobInfoDO);
     }
@@ -184,7 +185,7 @@ public class JobService {
         });
     }
 
-    private void refreshJob(JobInfoDO jobInfoDO) throws Exception {
+    private void calculateNextTriggerTime(JobInfoDO jobInfoDO) throws Exception {
         // 计算下次调度时间
         Date now = new Date();
         TimeExpressionType timeExpressionType = TimeExpressionType.of(jobInfoDO.getTimeExpressionType());
@@ -192,6 +193,9 @@ public class JobService {
         if (timeExpressionType == TimeExpressionType.CRON) {
             CronExpression cronExpression = new CronExpression(jobInfoDO.getTimeExpression());
             Date nextValidTime = cronExpression.getNextValidTimeAfter(now);
+            if (nextValidTime == null) {
+                throw new PowerJobException("invalid cron expression: " + jobInfoDO.getTimeExpression());
+            }
             jobInfoDO.setNextTriggerTime(nextValidTime.getTime());
         }else if (timeExpressionType == TimeExpressionType.API || timeExpressionType == TimeExpressionType.WORKFLOW) {
             jobInfoDO.setTimeExpression(null);
diff --git a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/timing/schedule/OmsScheduleService.java b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/timing/schedule/OmsScheduleService.java
index 3da63e5d..2115a664 100644
--- a/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/timing/schedule/OmsScheduleService.java
+++ b/powerjob-server/src/main/java/com/github/kfcfans/powerjob/server/service/timing/schedule/OmsScheduleService.java
@@ -121,8 +121,6 @@ public class OmsScheduleService {
      */
     private void scheduleCronJob(List<Long> appIds) {
 
-
-        Date now = new Date();
         long nowTime = System.currentTimeMillis();
         long timeThreshold = nowTime + 2 * SCHEDULE_RATE;
         Lists.partition(appIds, MAX_APP_NUM).forEach(partAppIds -> {
@@ -165,24 +163,13 @@ public class OmsScheduleService {
                 });
 
                 // 3. 计算下一次调度时间（忽略5S内的重复执行，即CRON模式下最小的连续执行间隔为 SCHEDULE_RATE ms）
-                List<JobInfoDO> updatedJobInfos = Lists.newLinkedList();
                 jobInfos.forEach(jobInfoDO -> {
-
                     try {
-
-                        Date nextTriggerTime = calculateNextTriggerTime(jobInfoDO.getNextTriggerTime(), jobInfoDO.getTimeExpression());
-
-                        JobInfoDO updatedJobInfo = new JobInfoDO();
-                        BeanUtils.copyProperties(jobInfoDO, updatedJobInfo);
-                        updatedJobInfo.setNextTriggerTime(nextTriggerTime.getTime());
-                        updatedJobInfo.setGmtModified(now);
-
-                        updatedJobInfos.add(updatedJobInfo);
+                        refreshJob(jobInfoDO);
                     } catch (Exception e) {
-                        log.error("[Job-{}] calculate next trigger time failed.", jobInfoDO.getId(), e);
+                        log.error("[Job-{}] refresh job failed.", jobInfoDO.getId(), e);
                     }
                 });
-                jobInfoRepository.saveAll(updatedJobInfos);
                 jobInfoRepository.flush();
 
 
@@ -203,7 +190,6 @@ public class OmsScheduleService {
                 return;
             }
 
-            Date now = new Date();
             wfInfos.forEach(wfInfo -> {
 
                 // 1. 先生成调度记录，防止不调度的情况发生
@@ -219,16 +205,9 @@ public class OmsScheduleService {
 
                 // 3. 重新计算下一次调度时间并更新
                 try {
-                    Date nextTriggerTime = calculateNextTriggerTime(wfInfo.getNextTriggerTime(), wfInfo.getTimeExpression());
-
-                    WorkflowInfoDO updateEntity = new WorkflowInfoDO();
-                    BeanUtils.copyProperties(wfInfo, updateEntity);
-
-                    updateEntity.setNextTriggerTime(nextTriggerTime.getTime());
-                    updateEntity.setGmtModified(now);
-                    workflowInfoRepository.save(updateEntity);
+                    refreshWorkflow(wfInfo);
                 }catch (Exception e) {
-                    log.error("[Workflow-{}] parse cron failed.", wfInfo.getId(), e);
+                    log.error("[Workflow-{}] refresh workflow failed.", wfInfo.getId(), e);
                 }
             });
             workflowInfoRepository.flush();
@@ -264,6 +243,40 @@ public class OmsScheduleService {
         });
     }
 
+    private void refreshJob(JobInfoDO jobInfo) throws Exception {
+        Date nextTriggerTime = calculateNextTriggerTime(jobInfo.getNextTriggerTime(), jobInfo.getTimeExpression());
+
+        JobInfoDO updatedJobInfo = new JobInfoDO();
+        BeanUtils.copyProperties(jobInfo, updatedJobInfo);
+
+        if (nextTriggerTime == null) {
+            log.warn("[Job-{}] this job won't be scheduled anymore, system will set the status to DISABLE!", jobInfo.getId());
+            updatedJobInfo.setStatus(SwitchableStatus.DISABLE.getV());
+        }else {
+            updatedJobInfo.setNextTriggerTime(nextTriggerTime.getTime());
+        }
+        updatedJobInfo.setGmtModified(new Date());
+
+        jobInfoRepository.save(updatedJobInfo);
+    }
+
+    private void refreshWorkflow(WorkflowInfoDO wfInfo) throws Exception {
+        Date nextTriggerTime = calculateNextTriggerTime(wfInfo.getNextTriggerTime(), wfInfo.getTimeExpression());
+
+        WorkflowInfoDO updateEntity = new WorkflowInfoDO();
+        BeanUtils.copyProperties(wfInfo, updateEntity);
+
+        if (nextTriggerTime == null) {
+            log.warn("[Workflow-{}] this workflow won't be scheduled anymore, system will set the status to DISABLE!", wfInfo.getId());
+            wfInfo.setStatus(SwitchableStatus.DISABLE.getV());
+        }else {
+            updateEntity.setNextTriggerTime(nextTriggerTime.getTime());
+        }
+
+        updateEntity.setGmtModified(new Date());
+        workflowInfoRepository.save(updateEntity);
+    }
+
     /**
      * 计算下次触发时间
      * @param preTriggerTime 前一次触发时间