To enhance the efficiency of tunneling and ensure the balance of mining and excavation succession in the mine, No.11211 Face of Kekegai Mine was taken as the research background, the support parameters of the No. 2 coal mining roadway were optimized by combining theoretical calculation, numerical simulation and on-site measurement. The results showed that under the design support parameters of No.11211 auxiliary roadway, the surrounding rock integrity was better and the deformation was small. The support parameters of No.11211 auxiliary roadway were optimized by theoretical calculation, and the support parameters before and after optimization are simulated and analyzed by FLAC3 D numerical simulation software. Under the optimized support parameters, the maximum displacement of roof and floor within 30 days after excavation of No.11211 auxiliary transportation roadway was 130 mm, which was 12 % higher than that before optimization, and the maximum displacement of two sides reached 70 mm, which was 15 % higher than that before optimization. The overall displacement of roof strata was small, which met the needs of mine production. The optimized support parameters not only improved the support efficiency and saved the support materials, but also had important guiding significance for improving the efficiency of roadway excavation.