The invention discloses a wide area network-oriented decomposition support method for an animation rendering task and an implementation method, which belong to the field of computer networks. According to the intensive computation characteristic of the animation rendering task and the characteristic that the transmission rate in a wide area network environment is limited to a network bottleneck bandwidth, the method comprises a visible range-based scene file and picture set splitting method, a node performance assessment method, an operation distribution strategy and integration and process control of the methods. During composition of the rendering task of a user, the scene file and picture set splitting method related to the invention is used and a scene is optimized according to the analysis of objects and pictures which are visible and invisible for the current scene camera, so that the aim of reducing a final rendering file is fulfilled. In a simplified model scene, a transmission data volume in a network can be effectively decreased, equivalent splitting of a scene file and a calculated amount is realized, and the distribution and execution of the fineness of rendering operation are facilitated. By using the method, the computing efficiency of each rendering client is brought into full play, and very high expandability is achieved.