On the basis of standard Ethernet, Time Sensitive Network (TSN) can ensure the real-time and reliability of data transmission by adding a series of key technologies such as high-precision time synchronization, resource reservation and path control, and traffic shaping and service scheduling.However, when heuristic algorithm realizes gating scheduling, the excessive cycle ratio of data leads to the problems of increased cache capacity and uncontrolled scheduling when data with the same priority are transmitted in the same direction at the same time.Therefore, the heuristic algorithm of gating scheduling is optimized and improved, and the problems of insufficient cache capacity and delay jitter are solved by adopting technologies such as data cycle sensing and output cache length sensing cycle.The simulation results show that, compared with the traditional heuristic algorithm, the algorithm can effectively reduce the storage space of the gate control list by 90% when the data cycle ratio exceeds 60 times, and the average delay jitter is reduced by about 50% under the same priority data transmission.