WHEN APPLYING A FLORESCENT POWDER COAT ON SCREEN, THE DIFFERENT KINDS OF FLORESCENT POWDER MAY OVERLAP OR COVER EACH OTHER. THIS IS CALLED COLOR MIXTURE. COLOR MIXTURE IS ONE OF THE MAIN FACTORS INFLUENCING THE QUALITY OF A COLOR PICTURE TUBE. IN THIS PAPER, THE BASIC SITUATION IN THE EARLIEST COLOR PICTURE TUBE PLANT IN P.R. CHINA ARE INTRODUCED. A DESIGN PROGRAM SOLVING THE COLOR MIXTURE PROBLEM BY USING A COLOR MIXTURE AUTOMATIC DETECTOR IS PROPOSED. THE FOUR KINDS OF COLOR MIXTURE ARE INDUCED. TO DETECT THIS COLOR MIXTURE, IT IS SUGGESTED THAT THREE DETECTORS MUST BE USED. FINALLY, THE MAIN TECHNICAL INDEXES OF SEVERAL COMPONENTS COMPOSED OF COLOR MIXTURE AUTOMATIC DETECTOR ARE GIVEN.