Environmental pollution and energy shortage are the most concerned issues in today's society. This problem is particularly prominent in the automotive industry. Therefore, the energy saving and emission reduction of automobiles is an urgent task to be solved. Reducing the weight of the entire vehicle can reduce energy consumption and at the same time reduce harmful gas emissions. Therefore, lightweight vehicles have become the best solution for energy saving and emission reduction. Carbon fiber composite material is the most potential material in the current automotive lightweight. With its own advantages such as high specific strength and high specific modulus, it has developed rapidly in recent years. The main research goal of this paper is to use continuous carbon fiber reinforced thermoplastic composites (CFRTP) instead of metal materials in the application of car seat frames. Around the lightweight design of the car seat frame, according to the anisotropic mechanical properties of CFRTP, the structural design and molding process of the composite seat frame are studied. The main contents include: 1. Modeling and finite element simulation analysis of the original metal seat frame, the results are used to compare the CFRTP seat frame structure design and verification of reliability. Then carry out the structural design of the carbon fiber composite seat frame, and establish a three-dimensional model, use ANSYS Workbench ACP finite element simulation software, and refer to the national standard to simulate the carbon fiber composite seat frame, and optimize the design of each component according to the simulation results. From the final analysis results, the static strength and stiffness of the CFRTP seat frame meet the design requirements. 2. Using tensile, bending, scanning electron microscopy, ultrasonic C-scan and differential scanning calorimetry and other testing and characterization methods, the lamination molding process used in the production of carbon fiber seat frame samples in this article is studied. The orthogonal test method was used to study the influence of molding temperature, pressure, time and cooling rate on the mechanical properties of composite laminates.