Abstract: The glass fiber reinforced polypropylene (GF/PP) composite laminates were prepared by hot molding press. Phase transition parameters were obtained by using differential scanning calorimetry (DSC) method. The variation characteristics of temperature field on the moulding processing of GF/PP composites was studied by using ANSYS finite element analysis, which provides a theoretical guidance and basis for optimizing the molding press process. The nonlinear relationship between thermodynamic parameters of composite and the temperature were defined into the material properties. The mechanical performance evaluation index of the material was evaluated by measuring the compression strength, interlaminar shear strength and impact toughness. The effect of preparation process on the mechanical properties of GF/PP composite laminates was discussed and analyzed using response hook surface methodology. The optimized molding press preparation parameters and the mechanical performance of composite laminates were obtained which laid the technology foundation for the automated placement of GF/PP composite. Test results show that the influence degrees of molding press process parameters for the mechanical performance of composite laminates are as follows:heating press temperature, heat holding time and heat holding pressure. The better molding press heating process parameters and the mechanical performance are as follows:heating temperature of 228℃, heating holding time of 6 min, holding pressure of 1.1 MPa and interlaminar shear strength of 31.12 MPa, compression strength of 100.96 MPa, impact toughness of 2.27 kJ/cm².