diff --git a/_posts/2012/2012-06-22-3d-coordinate-system.md b/_posts/2012/2012-06-22-3d-coordinate-system.md
index b9c4adc..cd2b78c 100644
--- a/_posts/2012/2012-06-22-3d-coordinate-system.md
+++ b/_posts/2012/2012-06-22-3d-coordinate-system.md
@@ -1,6 +1,6 @@
 ---
 layout: post
-title:Mac，iOS界面中的三维坐标系
+title: Mac，iOS界面中的三维坐标系
 categories:
 - Programming
 tags: