Abstract: To improve intelligent level and coordinative ability, cooperate with distributed grid services, and adapt to dynamic computing environment and variable user demands in the grid, cooperative intelligent grid (CIG) was proposed. CIG was based on OGSA, and the applied theory and methodology of distributed artificial intelligence and distributed coordinating control to improve the existing grid services' cooperativity and provide services to grid users more efficiently and accurately. The concept of CIG was introduced first, and followed by the description of the architecture of CIG, then the principles and methods for constructing an open and dynamic CIG with respect to the community/federal policy-driven system structure. The domain-adapting medium service collaboration mechanism and rational negotiation mechanism were discussed. CIG can effectively organize coordination, negotiation and collaboration among grid entities and improve the automation degree and abstract administrative levels of grid service composition.