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The automatic color match mechanismfrom the source planar graphics to the design graphics is studied. The color scheme of the source graphics is obtained by using color merging technology based on CIE Lab color space and K-means clustering method. Furthermore, the sub color scheme of each region with the same main color is obtained using image label technology. Based on these, the solution space of the color scheme of design graphics is constructed. Under comprehensively considering the factors such as the background and foreground, the configuration of the color ratio, the random creative demands and the color match of the similar foreground, the color scheme is matched from the source to the design graphics. The color scheme group is shown in image form for the designers to flexibly and conveniently choose and optimize. The algorithm is verified by a large number of design cases, which shows the feasibility of the algorithm.