Abstract: The rapid increasing tourists have brought a biggsh environmental pressure to Zhangjiajie National Forest Park in recent years.In order to realize the environmental protection and sustainable development,the best environmental capacity of the park must be made out to manage the tourists and control the numbers of hotels in the park.Using the field suvey method,the number of bed,the length of travel path and the total phosphorus content of water were used as the measuring indices to calculate the economic developmental capacity,daily spatial capacity,and seasonal ecological environmental capacity of the park respectively.Based on the calculation of economic development capacity,daily spatial capacity,and seasonal ecological environment capacity,the best tourism environmental capacities of Zhangjiajie National Forest Park,Hunan Province of China were made out.The results showed that the economic developmental capacity of the park was 41 400 persons per day,the daily spatial capacity was 13 255 persons per day,and the seasonal ecological environmental capacities varied markedly,which were 1 848 persons per day in spring,3 879 in summer,1 307 in autumn and 775 persons per day in winter.Through anzlyzing these results,the paper ascertained the best tourism environmental capacity of Zhangjiajie National Forest Park as 13 255 persons per day,and "the best inside accommodation capacity" of the park was 1 848 persons per day in spring,3 879 in summer,1 307 in autumn and 775 persons per day in winter.The results can provide suggestions to the management and control of the number of tourists entrying the park,the number of tourists accommodated in the park and the number of the hotels hold in the park.