Game is now being considered as " Ninth Category of Art", it could provide immersive experience to the player which other formats of art can not. Also, Game is a brand new media that could narrate the story to the audience in a totally different way. What are the common storytelling methods that game designers tend to use? For each genre of games, what would be the best storytelling method? Is there some kind of general patterns of storytelling in games? All these questions will be answered in this report.