diff --git a/blog/documents.py b/blog/documents.py
index 745b3b7..f8b25bb 100644
--- a/blog/documents.py
+++ b/blog/documents.py
@@ -43,6 +43,11 @@ class ElapsedTimeDocument(Document):
 
 
 class ElaspedTimeDocumentManager():
+    @staticmethod
+    def delete_index():
+        from elasticsearch import Elasticsearch
+        es = Elasticsearch(settings.ELASTICSEARCH_DSL['default']['hosts'])
+        es.indices.delete(index='performance', ignore=[400, 404])
 
     @staticmethod
     def create(url, time_taken, log_datetime, useragent, ip):
diff --git a/blog/management/commands/build_index.py b/blog/management/commands/build_index.py
index 850b042..39e4bce 100644
--- a/blog/management/commands/build_index.py
+++ b/blog/management/commands/build_index.py
@@ -11,7 +11,7 @@
 @time: 2019-04-20 20:39
 """
 
-from blog.documents import ElapsedTimeDocument, ArticleDocumentManager
+from blog.documents import ElapsedTimeDocument, ArticleDocumentManager, ElaspedTimeDocumentManager
 
 from django.core.management.base import BaseCommand
 from blog.models import Article
@@ -23,6 +23,7 @@ class Command(BaseCommand):
 
     def handle(self, *args, **options):
         manager = ElapsedTimeDocument()
+        ElaspedTimeDocumentManager.delete_index()
         manager.init()
         manager = ArticleDocumentManager()
         manager.delete_index()