I. Introduction
As the computer technology evolving, there are more and more computer games in the market and most of them can be separated into different categories like FPS (First Person Shooter), RPG (Role-playing game), and etc. Nowadays, game development teams can't just focus on the context of game itself, they have to consider the mobility, the platform independent, and the possibility of new user interface, which brought by device manufacture as well. Furthermore, the user interaction and innovative ideas are becoming the critical factors for being successful in the market of computer technology. Our team members observed the biggest social network application-Facebook, and find that the users' social activities, all time internet-accessibility, and downloadable apps are the main factors that Facebook became the most popular social network. By using the similar concepts as Facebook, we want to develop a virtual pet game based on community system. We believe our game can be distinct from others with the features of social network system.