diff --git a/app/jobs/job.go b/app/jobs/job.go
index 9ccd215..5d84807 100644
--- a/app/jobs/job.go
+++ b/app/jobs/job.go
@@ -10,7 +10,6 @@ import (
 	"os/exec"
 	"runtime/debug"
 	"strings"
-	"sync"
 	"time"
 )
 
@@ -41,14 +40,13 @@ func init() {
 }
 
 type Job struct {
-	id         int
-	logId      int64
-	name       string
-	task       *models.Task
-	runFunc    func(time.Duration) (string, string, error, bool)
-	running    sync.Mutex
-	status     int
-	Concurrent bool
+	id         int                                               // 任务ID
+	logId      int64                                             // 日志记录ID
+	name       string                                            // 任务名称
+	task       *models.Task                                      // 任务对象
+	runFunc    func(time.Duration) (string, string, error, bool) // 执行函数
+	status     int                                               // 任务状态，1表示正在执行中
+	Concurrent bool                                              // 同一个任务是否允许并行执行
 }
 
 func NewJobFromTask(task *models.Task) (*Job, error) {
@@ -57,7 +55,7 @@ func NewJobFromTask(task *models.Task) (*Job, error) {
 	}
 	job := NewCommandJob(task.Id, task.TaskName, task.Command)
 	job.task = task
-	job.Concurrent = task.Concurrent == 0
+	job.Concurrent = task.Concurrent == 1
 	return job, nil
 }
 
@@ -97,19 +95,17 @@ func (j *Job) GetLogId() int64 {
 }
 
 func (j *Job) Run() {
+	if !j.Concurrent && j.status > 0 {
+		beego.Debug(fmt.Sprintf("任务[%d]上一次执行尚未结束，本次被忽略。", j.id))
+		return
+	}
+
 	defer func() {
 		if err := recover(); err != nil {
 			beego.Error(err, "\n", string(debug.Stack()))
 		}
 	}()
 
-	t := time.Now()
-
-	if j.Concurrent {
-		j.running.Lock()
-		defer j.running.Unlock()
-	}
-
 	if workPool != nil {
 		workPool <- true
 		defer func() {
@@ -117,11 +113,14 @@ func (j *Job) Run() {
 		}()
 	}
 
-	j.status = 1
+	beego.Debug(fmt.Sprintf("开始执行任务: %d", j.id))
+
+	j.status++
 	defer func() {
-		j.status = 0
+		j.status--
 	}()
 
+	t := time.Now()
 	timeout := time.Duration(time.Hour * 24)
 	if j.task.Timeout > 0 {
 		timeout = time.Second * time.Duration(j.task.Timeout)
@@ -151,7 +150,7 @@ func (j *Job) Run() {
 	// 更新上次执行时间
 	j.task.PrevTime = t.Unix()
 	j.task.ExecuteTimes++
-	j.task.Update()
+	j.task.Update("PrevTime", "ExecuteTimes")
 
 	// 发送邮件通知
 	if (j.task.Notify == 1 && err != nil) || j.task.Notify == 2 {