Among numerous image fusion technology, image fusion based on wavelet transform has become a research hotspot in recent years. Wavelet transform with multi-resolution property ,have been proved to be effective in the integration of the coarse features and finer resolution details of images to produce a well fused image. This paper expounds Mallat algorithm of wavelet transform, meanwhile, probes deeply into the analysis and evaluation of fusion result of remote sensing images, proposes a method that the three kinds of statistical parameters are used synthetically for the quality evaluation of fused image. The experiment indicates that evaluation result coincides with the result of theoretical analysis and visual effect. This shows that these parameters can be used as the criteria to evaluate the objective effect of remote sensing images fusion.