Abstract: The Swallon Cavern in Jianshui County, Yunnan Province is an underground current cavern which accommodating both the visiting tourists and the habitating swallows. The two creatures’ existing in one cavern inevitably influences the sofisticated changes of the ecological environment in the cavern. The thesis based on this point, through the observation and analysis of the key factors of the cavern’s ecological environment, elucidates both the environmental qualities (such as the microclimate, quality of air and water body, quantity of natural areation and noises) and the accompanying but antirelationship between tourists and swallows. According to these stud-ies it also provides several meaningful ways of protecting the ecological environment of this cavern.

Key words: cavern, ecological environment, creature, ways of protecting