Cultural tradition of deity mountain forests is one of the cultural traditions of the ethnic groups in the mountainous regions of Yunnan.The local people whole-heartedly worship the geomantic forests,headwater forests,deity forests and great trees of their villages.This simple ecological ethics is of positive ecological significance for nature conservation.Additionally,this ethical conduct of ecology with such a background of cultural traditions has brought about their production methods and life style that conform to ecological ethics.At the same time,they have set village conventions and provisions to regulate their conducts and pass them on from generation to generation.In this paper,the authors elaborate on the significance of ecological ethics in the cultural tradition of deity mountain forests,which is based on survey of the cultural tradition and community of the Yi Mizhi forest (deity forest) in the areas of Stone Forest in Yunnan.The traditional cultures of other mountain nationalities are also taken account.