It is well-known that the sustainable development of tourism derives from ecological environment. Southwest is the one of the most enriched area of China’s tourism resources. Tourism economy has become the growth point of economic development in southwest area. Achievement of harmonious development between tourism and ecological environment is an important topic of promoting economic growth of southwest area that need to be deep thought. Research holds that tourism and has a complementary with ecological environment. Proper tourist activity can promote the development of ecological environment. However, too many activities are bound to affect the sustainable development of environment. This paper aims to evaluate the tourism ecological environmental carrying capacity in southwest area and found that tourism carrying capacity shows in different are of southwest shows complete different situation, which worries people a lot. Therefore, we must solve the existing problem to achieve sustainable development of regional tourism economy.