Aiming at the requirements of lightweight and low power consumption of airborne equipment， a reinforcement method of airborne LCD module based on support frame was proposed. Finite element iterative simulation calculation was used to optimize the design of heat dissipation plate reinforcement ribs and reduce the structural weight； Based on the ultra-thin light guide plate with a thickness of 2 mm， the design of the current backlight plate was improved through LED selection and LED layout， which improved the optical coupling efficiency of the ultra-thin light guide plate. Through calculation and test verification， the backlight power consumption of the LCD module has been significantly reduced.