diff --git a/pkg/admission/admit_job.go b/pkg/admission/admit_job.go
index 007c9847d4..1c4a28cfeb 100644
--- a/pkg/admission/admit_job.go
+++ b/pkg/admission/admit_job.go
@@ -26,12 +26,14 @@ import (
 
 	"k8s.io/api/admission/v1beta1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/validation"
 
 	v1alpha1 "volcano.sh/volcano/pkg/apis/batch/v1alpha1"
 )
 
 // job admit.
 func AdmitJobs(ar v1beta1.AdmissionReview) *v1beta1.AdmissionResponse {
+
 	glog.V(3).Infof("admitting jobs -- %s", ar.Request.Operation)
 
 	job, err := DecodeJob(ar.Request.Object, ar.Request.Resource)
@@ -83,6 +85,11 @@ func validateJobSpec(jobSpec v1alpha1.JobSpec, reviewResponse *v1beta1.Admission
 		// count replicas
 		totalReplicas = totalReplicas + task.Replicas
 
+		// validate task name
+		if errMsgs := validation.IsDNS1123Label(task.Name); len(errMsgs) > 0 {
+			msg = msg + fmt.Sprintf(" %v;", errMsgs)
+		}
+
 		// duplicate task name
 		if _, found := taskNames[task.Name]; found {
 			msg = msg + fmt.Sprintf(" duplicated task name %s;", task.Name)
diff --git a/pkg/admission/mutate_job.go b/pkg/admission/mutate_job.go
index 00af6a0065..63d0c270a9 100644
--- a/pkg/admission/mutate_job.go
+++ b/pkg/admission/mutate_job.go
@@ -20,6 +20,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/rand"
+	"strconv"
 	"time"
 
 	"github.com/golang/glog"
@@ -83,7 +84,7 @@ func mutateSpec(tasks []v1alpha1.TaskSpec, basePath string) (patch []patchOperat
 		// add default task name
 		taskName := tasks[index].Name
 		if len(taskName) == 0 {
-			tasks[index].Name = v1alpha1.DefaultTaskSpec
+			tasks[index].Name = v1alpha1.DefaultTaskSpec + strconv.Itoa(index)
 		}
 	}
 	patch = append(patch, patchOperation{