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To avoid color distortion and meanwhile exert display advantage of wide gamut displays, there needs gamut expansion mapping from the current standard gamut to the gamut of these devices. A gamut expansion method based on saturation enhancement in CIE-xy chromaticity diagram is proposed. The algorithm first divides the gamut triangle into two parts, the achromatic region and the normal color region. Then colors in the normal color region are processed with increasing saturation according to the ratio of maximal saturation of the two gamuts at the same hue with the to-be-mapped color. Gamut expansion mapping simulation of sampling points and images are carried out. The average CIELUV hue difference before and after the mapping is 0.049 when sampling points is 4913, and the proposed method averagely increases the CCI of the images by 23%.