diff --git a/apps/accounts/filters.py b/apps/accounts/filters.py
index dc28d78aa..e71a5b9fb 100644
--- a/apps/accounts/filters.py
+++ b/apps/accounts/filters.py
@@ -14,6 +14,7 @@ class AccountFilterSet(BaseFilterSet):
     username = drf_filters.CharFilter(field_name="username", lookup_expr='exact')
     address = drf_filters.CharFilter(field_name="asset__address", lookup_expr='exact')
     asset_id = drf_filters.CharFilter(field_name="asset", lookup_expr='exact')
+    asset = drf_filters.CharFilter(field_name='asset', lookup_expr='exact')
     assets = drf_filters.CharFilter(field_name='asset_id', lookup_expr='exact')
     nodes = drf_filters.CharFilter(method='filter_nodes')
     node_id = drf_filters.CharFilter(method='filter_nodes')
diff --git a/apps/terminal/models/applet/applet.py b/apps/terminal/models/applet/applet.py
index 07d63bce1..ccd1a8e52 100644
--- a/apps/terminal/models/applet/applet.py
+++ b/apps/terminal/models/applet/applet.py
@@ -156,10 +156,11 @@ class Applet(JMSBaseModel):
 
         spec_label = asset.labels.filter(name__in=['AppletHost', '发布机']).first()
         if spec_label:
-            host = [host for host in hosts if host.name == spec_label.value]
-            if host:
-                return host[0]
+            matched = [host for host in hosts if host.name == spec_label.value]
+            if matched:
+                return matched[0]
 
+        hosts = [h for h in hosts if h.auto_create_accounts]
         prefer_key = 'applet_host_prefer_{}'.format(user.id)
         prefer_host_id = cache.get(prefer_key, None)
         pref_host = [host for host in hosts if host.id == prefer_host_id]
@@ -213,22 +214,26 @@ class Applet(JMSBaseModel):
 
         private_account = valid_accounts.filter(username='js_{}'.format(user.username)).first()
         if not private_account:
+            logger.debug('Private account not found ...')
             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:
+            logger.debug('All can concurrent, use private account')
             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
+            private_is_using = len(cache.keys(private_using_key))
+            logger.debug("Private account is using: {}".format(private_is_using))
             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)
+            logger.debug("Private account is using {} by {}".format(private_is_using_by_this_app, self.name))
             if not private_is_using_by_this_app:
                 account = private_account
         return account
@@ -236,24 +241,32 @@ class Applet(JMSBaseModel):
     def select_host_account(self, user, asset):
         # 选择激活的发布机
         host = self.select_host(user, asset)
+        logger.info('Select applet host: {}'.format(host.name))
         if not host:
             return None
 
         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:
+            logger.debug('No private account, try to use public account')
             account = self.select_a_public_account(user, host, valid_accounts)
 
+        if not account:
+            logger.debug('No available account for applet host: {}'.format(host.name))
+            return None
+
         ttl = 60 * 60 * 24
         lock_key = self.accounts_using_key_tmpl.format(host.id, account.username, self.name)
         cache.set(lock_key, account.username, ttl)
 
-        return {
+        res = {
             'host': host,
             'account': account,
             'lock_key': lock_key,
             'ttl': ttl
         }
+        logger.debug('Select host and account: {}'.format(res))
+        return res
 
     def delete(self, using=None, keep_parents=False):
         platform = self.get_related_platform()