General satellite remotely sensed images are gained in condition of na-tural solar radiation（not including thermal infrared in here）.Because the opticalcharacteristic（including strength

directionality and their mutual effect with groundobjects）of each branch of natural ray

mainly direct and diffuse radiation

are dif-ferent

the radiating signal received by satellite is a compound response to eachbranch reflected by terrain. This paper intruduces resolution of remotely sensedimage and formation of direct and diffuse images.This is distinctive signficance inthe remote sensing basic and applied research domain

for example

making modeldistinction of remoted sensed image

quantitative inversion of ground information etc.