Abstract: During the procession of urbanization, the fill up of wetland occurs in many places, which results in the weakening of wetland functions. The construction of urban wetland park successfully combines the wetland protection and development harmoniously. Based on the potential economical analysis of ecological benefit, the construction of Nanjing Qinhuai River Wetland Park will greatly impulse the social development and environment protection in Jiangning District: contributing 1.69%～3.03% to GDP increase rate, accommodating 3900～7400 work offers, enhancing the land value of RMB 10.23 billion Yuan, and making RMB 780 million Yuan net sustainable benefit.