The effects of technical factors in different levels including adhesive temperature, stiring speed and time, as well as adhesive density on the stability of pigment in phenol formaldehyde resin were studied by single factor test method. Results showed that with the increase of the adhesive temperature, the mixing speed, the adhesive density and the mixing time, the stability of pigment in adhesive could be improved. The optimal factors were the temperature of 75～80 ℃, the mixing time for 40～50 min, the mixing speed of 100～110 r/min and the adhesive density of 1.1～1.2 g/cm 3.