In the course of remote sensing image processing

in order to meet the application needs

now

many algorithms have been provided for the fusion between high-resolution panchromatic image and low-resolution multi-spectral image.This paper infers Mallat algorithm and a′Trous（porous algorithm） algorithm theoretically

then provides specific calculation procedure.On the basis of them

multi-resolution analysis grey modulation（MRAGM algorithm） is put forward

at the same time

taking the fusion between SPOT image and TM image as an example.At last

three kinds of method are used for image fusion between SPOT high-resolution panchromatic image and TM low-resolution multi-spectral image respectively

and the fused image has been evaluated from qualitative and quantitative aspect.The conclusion is drawn that the new method proposed in this paper is better than other kinds of fusion algorithm.