This paper analyzes methods to remove cloud from remote sensing images based on the improved Retinex and wavelet transform.The method of Retinex is only effective on dark image,on which the improved Retinex algorithm is based by inversing image process,while the method of the wavelet theory is based on the characteristics of the multi-resolution of the wavelet transform.The detailed coefficients in the low layers are increased in order to stand out the scenery information,and the approximate coefficients pr...