The invention discloses a bandwidth optimization method and system suitable for cloud game scenes. The system comprises an instruction agent module, a state management module, a model optimization module and a network transmission module, wherein the instruction agent module, the state management module, the model optimization module and the network transmission module are located at a server end. The instruction agent module captures instructions and data called in a game process, the state management module processes the instructions and the data, and state inquiry and setting are carried out on client-side equipment if the instructions are equipment related instructions. The instructions and the data are put in a data structure of a corresponding model if the instructions are model related instructions, and the model is simplified through a model optimization module before model rendering. The model optimization module recognizes the model in the scenes from the instructions and the data, and carries out compression on the model according to the position of the model in the scenes and peak complexity information, so that the bandwidth needed by a system is reduced. The network transmission module is used for sending instruction data related to the simplified model to a client-side. High bandwidth needing under the cloud game scenes can be effectively reduced through the implementation of the bandwidth optimization method and system.