This paper presents a change detection approach of remote sensing images based on fusion and general Gauss model（GGM）.This method constructs difference image by fusing the results of subtraction operation and division operation

then

processes difference image by gray morphology

again

estimates the probability density of change pixels and no-change pixels by GGM

finally

calculates the optimal threshold by the improved KI approach and extracts the changed regions.Experiments show that the method of fusion and GGM is solid and efficacious

which has preferable application value.