Shuguang heavy oil fire flooding has entered the stage of scale implementation. In order to improve the reservoir longitudinal utilization difference and uneven development of oil wells on the surface, based on the re-analysis of reservoir physical property, gas suction condition and gas injection parameters, the injection mode and gas injection parameters were optimized. The method solves the difficulties of gas channeling, uneven effect and difficult tracking and control in the process of in situ combustion, improving the development effect of fire flooding and oil production greatly. It also provides a powerful technical support for the development mode of Shuguang heavy oil fire flooding and a reference for the development of similar reservoirs as well.