Abstract: Wetland is one of the most important environmental Capitals, its ecotypic characteristics is differing to land and water, and is unique in hydrogeology under the inter-function of themselves and the special ecotypic function. Water cycling is the important in the Wetland ecotypic function. Also is the most important energy and physical medium. Wetland hydrogeology characteristics analysis is indispensable in Wetland study, Wetland plan and Wetland ecotypic recovery. The article briefly analyzes the reduction factor of the Wetland to give suggestion and recommendation for protection plan to bring the topic for further study together with the on going analysis on Bio-hydrogeology characteristics in Tonghu Wetland area.