into a position and then the overprint color separation stamp of each color in a color sequence is pressed against the set square 6 to complete the overprint process static charges may be attached onto the stamp fixing base 5 to facilitate users to hold the stamp before pressing the overprint stamp y or facilitate user to press the stamp y basically the overprint color separation stamp can be fixed into its position easily for an alignment of the stamp during the overprint process even if the set square 6 is not positioned or aligned with the edges with reference to fig4 for an overprint of the present invention each overprint color separation stamp is positioned by the set square 6 without being affected by the overprint position of each overprint color separation stamp even if the size of the stamp fixing base is not equal to the frame size of the overprint stamp with reference to fig5 for combining each overprint color separation stamp art is very unique although each overprint color separation stamp produces each color separation surface pattern by the electronic color separation and thus an overprint color separation stamp of different surface patterns can provide different patterns and one of the different layouts of the mesh points and the color arrangement is not unique this is exactly the interesting and meaningful point of the present invention so that users can use a different combination or permutation of colors anytime to stamp and produce a pattern in different colors with reference to fig6 for a schematic view of an overprint after colors are combined as depicted in fig2 a numeral 14 is used for representing the color of overprinting yellow mesh points 1 and black mesh points 4 the visual.