Aiming at the problem of uneven heating in vulcanizing machine heated by silicon rubber heating sheet，A scheme of replacing single channel layout with three-channel return layout is proposed.First A three-level and five-factor orthogonal test is designed for the parameters of heating spacing and power.Based on Comsol solid heat transfer simulation technology, the temperature distribution law of each scheme heating plate is simulated and the range analysis is carried out.Then best design scheme is obtained. Sometimes the physical test is verified and studyFinally it is found that the most significant factor affecting the uniformity of the heating plate is the edge heat flux.With the original single-channel heating method, the temperature difference on the heating plate surface of the optimal scheme was reduced from 12℃ to 3.8℃ and the uniformity index F value is reduced by 1.3. It effectively prove the effectiveness of the design scheme and provide research methods and ideas for actual production.