In the investigation of forest resources and dvnamic monitoring

it isgenerally required to distinguish tree species.If the species are complicated

it iSalso required to distinguish the species groups with similar biological characteristics.In drawing the maps it is required to have great geometric accuracy.The mediumscale image with distinct type border（for example

the image of 1/25000）can becomposed and drawn directly.To meet the needs of the investigation of forest re-sources and dynamic monitoring

we conducted the study on information compound. It includ 5 the study on the practical techniques of remote sensing information com-pound

remote sensing and non-remote-sensing information compounds

applicationof auxiliary information

compound method

etc.In experiments

we used the studiesof the satellite images of MSS and TM

the images of different temporal images ofTM

the compound of TM and SPOT

the quantitative analysis of the characteristicchanges of information before and after compound

etc.Thus provide basis for op-timum wave-band combination and the method of extracting characteristic informa-tion

and also provide the best satellite images of 1/25000 on more than 500 thou-sand hectares of and for the investigation of forest resources in the region of BaiLong Jiang River to conduct the second type of the investigation of forest resour-ces.In the analysis of dynamic monitoring

the following land type were mainlydetermined:cut-over land

forest wall and regeneration of cut-over land

etc.;theassessment Of accuracy of determination was also conducted.