The invention discloses a method and system for off line controlling the key data of the application program acquired by a game client not to be freely shared in an off-line state. By the method, a game player can play the game and obtain the key data of the application program in an off-line state by game software. Under the control of the method, the key data of the application program acquired by the game player in an off-line state can not be freely shared by other game users, and therefore a game developer can control the key data of the application program.