Composite service models can be classified into four types according to the different management of their control-flow and data-flow, namely, centralized control-flow and centralized data-flow, centralized control-flow and decentralized data-flow, decentralized control-flow and centralized data-flow, and decentralized control-flow and decentralized data-flow. We also give our quantitative inference based on the mathematical models to the conclusion that the decentralized control-flow and decentralized data-flow model can reduce the whole message size and lead to lower response time in geospatial services composition. Our simulation confirms the conclusion.