Through discussing the forest change in geologic period,the authors made a point that the stand system of broadleaved forests in Yunnan province was random variables sequences,which was in comply with the Markov process.Using the Markov process to describe the existence and evolution of stand system of broadleaved forests in Yunnan province,it was found that the studied stand system was a random process,characterized by non-aftereffect and timehomogeneous.The suitable elevation for distribution of broadleav...