Abstract: After analyzing the present condition of tropical forest in the world and the features of tropical forest in China as well as its research in the past.Two problems that happened at first in the research of tropical forest have been emphatically studied,i.e.the classification method and inventory plan.Based on the research of the tropical forest in China,the method Of remote sensing was put forward to study the regional or even the globe's tropical forest.Meanwhile,it should be pointed out that under the premise of macroscopic monitoring,the remote sensing method can't be replaced.In the aspect of classification,a method was suggested, which was based on the pre-classification of using weather conditions(precipitation and temperature)and elevation,and then used remote sensing data(density value)to identify vegetation coverage.In the aspect of inventory plan,the method of assessing area and growing stock in a certain area or in a large area,was put forward.Inthe meantime,among the experimental data,a comparison was made between the trozical,subtropical and temperate forest.It shows that the method is promising.