In order to solve the problem that cracks are generated randomly and can’ t be controlled in the production of glass screen, a countermeasure to change the internal cooling structure of punch was proposed. Based on the principle and method of mold heat transfer analysis, the flow and heat transfer model of cooling water in the cooling cavity of glass screen mold and the surface heat transfer model of mold cooling cavity were established. Based on the study of heat transfer mechanism and the analysis of cooling structure of glass screen mold, an improved scheme of slotting and drilling for glass screen mold cooling structure was proposed, and Fluent analysis model was constructed. The simulation results show that with the improved cooling structure, the temperature of the long and short sides of the glass inner wall is reduced by 30 ℃ and the temperature of the punch itself is reduced by 36 ℃ after the punch is slotted;the temperature of the long and short sides of the glass inner wall is decreased by 20 ℃ after the punch is drilled, and the temperature of the punch itself is reduced by 23 ℃;the temperature gradient curve changes gently at the inner wall with problems,the feasibility of the improved scheme is verified.