Abstract: This paper deals with the technological process of applying Landsat MSS data to forest inventory at the forest bureau,evaluates the accuracy of the Survey and Compares the field work load and production cost with traditional methods.The study done at Qiao Shan Forest Bureau reveals that by means of computer analysis of Landsat MSS data we can easily estimate the areas of varied land types and timber volumes,and draw the forest map and timber volume distribution map.Moreover,the techniques is possessed of the following advantages: high efficiency,low cost and less field workdays.In the forest zone in North China,especially in that part of forest where it is hard of access and has not yet been opened up.The techniques will be very useful.