Purpose: In this paper

we accomplish image fusing of CT and MRI images using wavelet.Methods: As wavelet is of comfortable effect in image fusing

more and more researchers are working on it.And

in Matlab

there is a toolbox called Wavelet Toolbox 3.0

with which we can finish some image fusing simply.With some drawbacks

the toolbox works not so well with some kinds of image pairs

such as a picture of ct and a picture of pet

if the pet image is gray image instead of a counterfeit color image.Then the resulted image if of bad quality with low-lying effect.In order to achieve a good result of image fusing we should think about many aspects of it and realize them by program.Result: We strive to fulfill the program and compare the result to what we have got by toolbox.And the effect is comfortable.Conclusion: By wavelet toolbox

some simple medical image fusing can be accomplished.But with the development of technique of image fusing and the deepening of complexity of medical images

the process of image fusing would be more complex especially those images rooted from abdomen and chest.So more methods must be called for rather than toolboxes.