Abstract: The uniformity of the temperature field of the direct heating mold of the composite material curing molding process was studied. A coupled heat transfer model of mold temperature field and composite material curing reaction temperature field was established, and finite element modeling and simulation analysis was performed on the model. In view of the main factors that affect the uniformity of the mold surface temperature, which are the distance and power of the electric heating tube, the orthogonal experiment was designed to optimize, and the maximum temperature difference of the mold surface after optimization was 3.5℃, which reached the industry standard. In addition, other factors that affect the uniformity of the temperature field, the thermal resistance of the contact between the heating tube and the mold, and the thickness of the composite laminate were discussed. The existence of contact thermal resistance makes the maximum temperature difference of the mold surface reach 7.24℃, and it takes 800 s to heat the mold to the specified temperature, which reduces the efficiency. When studying the effect of laminates on mold temperature uniformity, it is found that the maximum temperature difference on the mold surface without composite materials is 4.44℃; the maximum temperature difference after coupling with laminates is 3.5℃, and the thickness of the laminate is millimeter-level. The uniformity has little effect.