Abstract: CSCW platform coupled with network cooperation system is the foundation to support the cooperative activities of industrial alliance. The theory of fractal network cooperation is established by following the fractal principle of nature to support the quick reconfiguration of the networked cooperative manufacturing system. A fractal agent model, being self-resembling, self-organizing and human-machine coupled, is raised to represent the hierarchical organizations of industrial alliance. Based on the fractal agent model and fractal L system, a fractal network cooperation system is constructed. Owing to the resemblance in architecture and workflow of enterprise-level cooperation system with the corresponding one of department-level, the development of the network cooperation system can be greatly simplified. Eventually the paper gives a practical example of fractal cooperation system to manufacture hydraulic equipment on CSCW information platform.