When I view for Ad Formats, there'r Video format. But there no where guide to show it up. Who can do that? Show me sample!

Thanks

I don't fully understand what you are saying.. But if you mean "when do video adverts appear" the answer is when google feel like it.
If there is a video ad that is suitable for your site it will be displayed, If there isn't it won't.

At the moment there are very few people using video ads, So it's highly unlikely that they will be appearing on your site just yet when there are far far more text ads and image ads.