Sound effect is an important way to increase the realism of the game.Appropriate sound effects to certain act or operation taken by players in the game world help to render a real atmosphere.This paper studies the sound effect system in an actual development of an MMORPG web game Greathan,improving the sound system to a design with smaller storage space and easy to manage from resource management,configuration management to programming.Finally,the sound effect system is being used by the web game Greathan.