the name of that movie about a man who digs out prison and he has poster over hole in this room?

The movie you are referring to is "The Shawshank Redemption" (1994), starring Morgan Freeman and Tim Robbins. In this movie, Andy Dufresne (played by Tim Robbins), a banker who was wrongfully convicted of murdering his wife, spends years digging an escape tunnel out of his prison cell using a tiny rock hammer and hiding the hole behind a movie poster.