Abstract: The research on tourism environmental capacity can provide a scientific basis for regional tourism development and management. Taking the Southern Sichuan Bamboo Sea as an example, the tourism environmental capacity was estimated from four aspects of tourism ecological, facilities, space and social environmental capacity by using the data of a field survey. The results showed that social environmental capacity (9150 person/day) was the biggest, the second was ecological environment capacity (7766 person/day), the space environment capacity (4908 person/day) balanced the facilities environmental capacity (4000 person/day). Based on the cask principle and expert score weight, the tourism environmental capacity of the Southern Sichuan Bamboo Sea was estimated as 2.76 million people per year, compared with recent tourist amount, there was still a large reception potential. Therefore, combined with the scenic spot development, some feasible suggestions were put forward to provide theoretical references for realizing the sustainable development of the Southern Sichuan Bamboo Sea.