Ok, I'll explain what is Google Shandbox first. I got it from wikipedia
The Sandbox (a.k.a. Sandboxing or the sandbox effect or the Google penalty) is a name given to an observation about the way Google ranks web pages in its index. It is the subject of much debate—its existence has been written about but not confirmed and several observers state that they have observed the contrary.
Discussion regarding the Google Sandbox effect began to arise in early 2004. According to the sandbox effect, links which may normally be weighted by Google's ranking algorithm, not least improving the position of a webpage in Google's index, may be subjected to filtering to prevent their having a full impact. Some observations have suggested that two important factors for causing this filter to come into play are the active age of a domain, and the competitiveness of the keywords used in links.
A "reverse sandbox" effect is also claimed to exist, whereby new pages with good content, but without inbound links, are temporarily increased in rank—much like the "New Releases" in a book store are displayed more prominently—to encourage organic building of the World Wide Web.
How to get out of google sandbox ?
- Update your articles which is banned by Google ( Google Sandbox )
- Posting an articles to your blog about you got banned by google ( Google Sandbox )
- Keep posting a new articles that created by your self. Don't copy another articles.
- Resubmit sitemap to your Webmaster Tools
- Inbound link
- Get backlink
- Pray to your God :)
It's easy just check your website here : Sandbox Checker
Hope this article useful for you all :)