The present invention relates to proof quality control, in particular to a method for color control in a printing machine by means of a computer in a printing order implementation period. The method comprises: digitally detecting a printing proof by a measuring instrument or transmitting pre-printing period digital image data of the printing proof to the computer; calculating a color value according to the digital image data of the printing proof or the pre-printing period digital image data in the computer; digitally detecting the image data by the measuring instrument in an adjusting period and calculating a color value in the computer; comparing a color value of an printing image with the color value of the pre-printing period digital data or the printing proof digital data in a common color space, and geometrically corresponding the color value of the printing proof and the color value of the printing image in the computer; calculating and assigning a color matching target value by using the measured proof data or by applying a printing configuration description file to digital data of the printing proof and a printing material to be detected; calculating the best color adjustment result by the computer; and adjusting an ink proportioning device to achieve the color adjustment result.