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From the view of knowledge accumulation, knowledge accumulation cost (KAC) model is built in information systems integration project. With this model, get conclusion that high knowledge sharing would be helpful for project cost controlling, and on condition of fixed knowledge sharing degree higher information systems integration innovation introduces higher project cost, while higher study capability makes it lower. Further more, when innovation degree for integration is high controlling project cost would demand high knowledge sharing, on the contrary when study capability is high knowledge sharing gives little influence on project cost. Then application case is introduced and this conclusion is used in getting some action for project cost controlling.