Multi spectral remote sensor image synthesis is directly extracted from R, G, B bands of the multispectral images. Because of the mismatch between the spectral response characteristics of multi spectral imaging detector and international commission on illumination (CIE) color matching functions, color images appear serious color distortion. In order to correct the color distortion, color correction is needed. Aiming at the shortcoming of traditional white balance method and color synthesis method, improved multi point color synthesis method based on spectral tunable light emitting diode (LED) integrating sphere is proposed. This method not only contains the spectral features of the objects but also is easy to realize. It is proved that the color chromaticity error of the target can reach 0.15 corrected by white balance. However the color chromaticity error of the target can be limited less than 0.05 when the method is used to correct the color distortion.