diff --git a/internal/web/actions/default/clusters/create.go b/internal/web/actions/default/clusters/create.go
index 957dea05..274ff26a 100644
--- a/internal/web/actions/default/clusters/create.go
+++ b/internal/web/actions/default/clusters/create.go
@@ -1,7 +1,9 @@
 package clusters
 
 import (
+	"crypto/rand"
 	"encoding/json"
+	"fmt"
 	"github.com/TeaOSLab/EdgeAdmin/internal/web/actions/actionutils"
 	"github.com/TeaOSLab/EdgeAdmin/internal/web/actions/default/dns/domains/domainutils"
 	"github.com/TeaOSLab/EdgeCommon/pkg/langs/codes"
@@ -9,6 +11,7 @@ import (
 	"github.com/TeaOSLab/EdgeCommon/pkg/rpc/pb"
 	"github.com/TeaOSLab/EdgeCommon/pkg/serverconfigs"
 	"github.com/iwind/TeaGo/actions"
+	"github.com/iwind/TeaGo/rands"
 )
 
 type CreateAction struct {
@@ -44,6 +47,18 @@ func (this *CreateAction) RunGet(params struct{}) {
 	}
 	this.Data["totalNodes"] = totalNodesResp.Count
 
+	// 随机子域名
+	var defaultDNSName = "g" + rands.HexString(6) + ".cdn"
+	{
+		var b = make([]byte, 3)
+		_, err = rand.Read(b)
+		if err == nil {
+			defaultDNSName = fmt.Sprintf("g%x.cdn", b)
+		}
+	}
+	this.Data["defaultDNSName"] = defaultDNSName
+	this.Data["dnsName"] = defaultDNSName
+
 	this.Show()
 }
 
diff --git a/web/views/@default/clusters/create.html b/web/views/@default/clusters/create.html
index c610580f..6e84236b 100644
--- a/web/views/@default/clusters/create.html
+++ b/web/views/@default/clusters/create.html
@@ -85,11 +85,11 @@
 			<td class="title">DNS子域名</td>
 			<td>
 				<div class="ui input right labeled">
-					<input type="text" name="dnsName" maxlength="64" style="width:10em"/>
+					<input type="text" name="dnsName" maxlength="64" style="width:10em" v-model="dnsName"/>
 					<span class="ui label" v-if="domain != null && domain.name != null && domain.name.length > 0">.{{domain.name}}</span>
                     <span class="ui label" v-else>.主域名</span>
 				</div>
-				<p class="comment">当前集群的子域名，和主域名一起组成集群节点的子域名。</p>
+				<p class="comment"><span v-if="dnsName == defaultDNSName" class="red">当前已为你生成默认的子域名。</span>当前集群的子域名，和主域名一起组成集群节点的子域名。</p>
 			</td>
 		</tr>
         <tr>