How to Intergrate Google Game Services?

How to Intergrate Google Game Services?
I wanna create a leaderboard for that?
Any idea?or Tutorial?

Have you read the official docs?

Which official docs you mean to?

Google “google game services” second link?

the sdk at official suitable with unity?

Sure, but you will need to integrate by yourself. It is a hard but learning process. This is a good start point:

http://docs.unity3d.com/Documentation/Manual/PluginsForAndroid.html

The best solution was if unity3d integrate google play services in their social api.It works for IOS, but I don’t how it match with other platforms.

http://docs.unity3d.com/Documentation/ScriptReference/Social.html

If you want something ready to go, you must pay for a plugin, like prime 31:

http://prime31.com/docs#androidPlayGameServices