diff --git a/apps/terminal/migrations/0061_applet_can_concurrent.py b/apps/terminal/migrations/0061_applet_can_concurrent.py
index 4ca762e65..5041e5425 100644
--- a/apps/terminal/migrations/0061_applet_can_concurrent.py
+++ b/apps/terminal/migrations/0061_applet_can_concurrent.py
@@ -13,6 +13,6 @@ class Migration(migrations.Migration):
         migrations.AddField(
             model_name='applet',
             name='can_concurrent',
-            field=models.BooleanField(default=True, verbose_name='Can concurrent'),
+            field=models.BooleanField(default=False, verbose_name='Can concurrent'),
         ),
     ]
diff --git a/apps/terminal/models/applet/applet.py b/apps/terminal/models/applet/applet.py
index be6b397ff..07d63bce1 100644
--- a/apps/terminal/models/applet/applet.py
+++ b/apps/terminal/models/applet/applet.py
@@ -39,7 +39,7 @@ class Applet(JMSBaseModel):
     is_active = models.BooleanField(default=True, verbose_name=_('Is active'))
     builtin = models.BooleanField(default=False, verbose_name=_('Builtin'))
     protocols = models.JSONField(default=list, verbose_name=_('Protocol'))
-    can_concurrent = models.BooleanField(default=True, verbose_name=_('Can concurrent'))
+    can_concurrent = models.BooleanField(default=False, verbose_name=_('Can concurrent'))
     tags = models.JSONField(default=list, verbose_name=_('Tags'))
     comment = models.TextField(default='', blank=True, verbose_name=_('Comment'))
     hosts = models.ManyToManyField(
@@ -193,38 +193,59 @@ class Applet(JMSBaseModel):
             cache.set(prefer_host_account_key, account.id, timeout=None)
         return account
 
+    accounts_using_key_tmpl = 'applet_host_accounts_{}_{}_{}'
+
+    def select_a_public_account(self, user, host, valid_accounts):
+        using_keys = cache.keys(self.accounts_using_key_tmpl.format(host.id, '*', '*')) or []
+        accounts_username_used = list(cache.get_many(using_keys).values())
+        logger.debug('Applet host account using: {}: {}'.format(host.name, accounts_username_used))
+        accounts = valid_accounts.exclude(username__in=accounts_username_used)
+        public_accounts = accounts.filter(username__startswith='jms_')
+        if not public_accounts:
+            public_accounts = accounts.exclude(username__in=['Administrator', 'root'])
+        account = self.random_select_prefer_account(user, host, public_accounts)
+        return account
+
+    def try_to_use_private_account(self, user, host, valid_accounts):
+        host_can_concurrent = str(host.deploy_options.get('RDS_fSingleSessionPerUser', 0)) == '0'
+        app_can_concurrent = self.can_concurrent or self.type == 'web'
+        all_can_concurrent = host_can_concurrent and app_can_concurrent
+
+        private_account = valid_accounts.filter(username='js_{}'.format(user.username)).first()
+        if not private_account:
+            return None
+        # 优先使用 private account，支持并发或者不支持并发时，如果私有没有被占用，则使用私有
+        account = None
+        # 如果都支持，不管私有是否被占用，都使用私有
+        if all_can_concurrent:
+            account = private_account
+        # 如果主机都不支持并发，则查询一下私有账号有没有任何应用使用，如果没有被使用，则使用私有
+        elif not host_can_concurrent:
+            private_using_key = self.accounts_using_key_tmpl.format(host.id, private_account.username, '*')
+            private_is_using = len(cache.keys(private_using_key, [])) > 0
+            if not private_is_using:
+                account = private_account
+        # 如果主机支持，但是应用不支持并发，则查询一下私有账号有没有被这个应用使用, 如果没有被使用，则使用私有
+        elif host_can_concurrent and not app_can_concurrent:
+            private_app_using_key = self.accounts_using_key_tmpl.format(host.id, private_account.username, self.name)
+            private_is_using_by_this_app = cache.get(private_app_using_key, False)
+            if not private_is_using_by_this_app:
+                account = private_account
+        return account
+
     def select_host_account(self, user, asset):
         # 选择激活的发布机
         host = self.select_host(user, asset)
         if not host:
             return None
-        host_concurrent = str(host.deploy_options.get('RDS_fSingleSessionPerUser', 0)) == '0'
-        can_concurrent = (self.can_concurrent or self.type == 'web') and host_concurrent
-
-        accounts = host.accounts.all().filter(is_active=True, privileged=False)
-        private_account = accounts.filter(username='js_{}'.format(user.username)).first()
-        accounts_using_key_tmpl = 'applet_host_accounts_{}_{}'
 
-        if private_account and can_concurrent:
-            account = private_account
-        else:
-            using_keys = cache.keys(accounts_using_key_tmpl.format(host.id, '*')) or []
-            accounts_username_used = list(cache.get_many(using_keys).values())
-            logger.debug('Applet host account using: {}: {}'.format(host.name, accounts_username_used))
+        valid_accounts = host.accounts.all().filter(is_active=True, privileged=False)
+        account = self.try_to_use_private_account(user, host, valid_accounts)
+        if not account:
+            account = self.select_a_public_account(user, host, valid_accounts)
 
-            # 优先使用 private account
-            if private_account and private_account.username not in accounts_username_used:
-                account = private_account
-            else:
-                accounts = accounts.exclude(username__in=accounts_username_used)
-                public_accounts = accounts.filter(username__startswith='jms_')
-                if not public_accounts:
-                    public_accounts = accounts.exclude(username__in=['Administrator', 'root'])
-                account = self.random_select_prefer_account(user, host, public_accounts)
-                if not account:
-                    return
         ttl = 60 * 60 * 24
-        lock_key = accounts_using_key_tmpl.format(host.id, account.username)
+        lock_key = self.accounts_using_key_tmpl.format(host.id, account.username, self.name)
         cache.set(lock_key, account.username, ttl)
 
         return {