In this paper, The ecotourism environmental capacity model was established from ecological capacity, spatial capacity, facility capacity and psychological capacity to estimate the ecotourism environmental capacity of YunLong Lake, DaLong Lake and JiuLi Lake in Xuzhou city. The results showed that: (1) The ecotourism environment capacity of YunLong lake, DaLong lake and JiuLi lake was respectively 15022-24072 thousand persons/year, 5646-8096 thousand persons/year, and 2517-3634 thousand persons/year. An early warning mechanism for the peak season human flow should be put forward according that the current annual statistics of the three wetland parks had exceeded the minimum limit and not reached the maximum limit; (2) The restriction factors of water environmental capacity of the three wetland parks were different, so different treatment plans should be put forward according to the situation of pollutants, so as to improve the water environment quality and environment capacity of ecotourism. Watching-bird capacity was the limiting factor of the ecological capacity of the three wetland parks; (3) The limiting factor of facility capacity of each wetland park was mainly parking space. Increasing the number of parking space without destroying the environment was the key factor to improve the facility capacity and even the environmental capacity of the three wetland parks.