Abstract: Population explosion and overuse of natural resourceshave resulted in abnormal change of global climate and deterioration of ecological environment. At the same time, the plant diversity is lost at an unprecedented speed and the species of plants are decreasing rapidly or some even die out, which has affected human existence. As a result, it is urgent to protect plant diversity. According to the requirements of protecting forest plant diversity, research work focuses on layout of monitoring plots, single tree monitoring techniqe, and use of spatial information technique and plant survey technique for laying out of sampling plots and areas for plant diversity monitoring.

Key words: plant diversity, fixed sample plot monitoring, TotalStation & Personal Digital Assistant (TS/PDA)