The embodiment of the invention discloses a method and a device for optimizing game scenes, and relates to the field of performance optimization of a computer system. The operation smoothness degree of games can be improved. The method for optimizing the game scenes comprises the following steps that a starting behavior of a program is monitored; when the program starting is monitored, whether a user enters a game scene or not is identified; if the behavior that the user enters the game scene is identified, programs, except a game program corresponding to the game scene, operating in the current system are optimized. The device for optimizing the game scenes comprises a monitoring unit, an identifying unit and an optimizing unit, wherein the monitoring unit is used for monitoring the starting behavior of the program, the identifying unit is used for identifying whether the user enters one game scene or not when the monitoring unit monitors the program starting, and the optimizing unit is used for optimizing the programs, except the game program corresponding to the game scene, operating in the current system when the identifying unit identifies that the user enters the game scene. The method and the system are applicable to occasions requiring the smooth operation of the games.