Abstract:The sponge city Construction plays an important role in optimizing the urban ecological environment, harnessing water pollution and alleviating the problem of urban water shortage in Henan province. Through the research on the comprehensive dynamic mechanism of the sponge city construction, it has important significance to the development and maturity of the sponge city construction. Taking Henan Province as an example, this article, based on the theory frame analysis of the sponge city construction, analyzes the essential factor, principle of action and evolution process of the sponge city construction according to system dynamics. We may reach the following conclusions: the development of the sponge city construction was the interaction of Internal and external element, dynamic mechanism, social benefit and economic benefit. The dynamic mechanism of the sponge city construction is based on the formation of internal and external factors, and resulting from market demand and social demand, Which alsoact as virtuous cycle propulsion implemented by the government"s support and guiding.