通过对ＧＰＳ、ＧＩＳ、ＴＭ遥感图象叠合的三种方法进行比较、分析，认为在广东林区，采用以ＧＰＳ坐标数据为主，结合ＧＩＳ，辅以目视判读的叠合方法，进行ＧＰＳ、ＧＩＳ、ＴＭ遥感图象叠合效果最好。在ＧＰＳ、ＧＩＳ、ＴＭ遥感图象叠合前，必须对ＴＭ遥感图象作局部几何纠正，特别是在植被组成复杂，林下植被多且高，中等郁闭度，坡位中部，坡度陡的地方。 By comparing and analyzing the three methods of superimposing the remote sensing images of GPS, GIS and TM, it is considered that GPS data and GPS are combined in the forest area of ​​Guangdong and the superposition method of visual interpretation is adopted to carry out GPS , GIS, TM remote sensing image is the best. Before the GPS, GIS, TM remote sensing images are superimposed, the local geometric correction of the TM remote sensing images must be made, especially in the complex vegetation composition, with more and more afforestation vegetation, moderate canopy density, steep central slope and steep slope local.