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(Low Earth Orbit) LEO satellite communication system is not restricted by geographical conditions and compared to ground communication, there are wide coverage, low operation and maintenance costs, and the short deployment period than ground communication, therefore, it is gradually gaining the attention of more and more people. But as for the LEO satellite communication system, the total transmission and the processing latency increased significantly due to the wireless mesh network with many satellite nodes. A new network technology named deterministic networking is mentioned by the industry in recent years. The deterministic networking can solve the requirements of the traditional packet loss and delay which is matching the requirements of the LEO satellite networks. The key technologies of the deterministic network of the ground network and the relevant characteristics of the satellite network are studied. The deterministic network technology is applied to the LEO constellation, and the ATS asynchronous traffic shaping algorithm is applied to the inter satellite ground flow control,then proposes an on-board switch mechanism, which optimizes the resource usage and packet loss of the on-board switch. The relevant scenarios were simulated with NS3 software, and the results were analyzed. In many simulation scenarios, the utilization of on-board resources was optimized, which alleviated the network congestion problem. Under the optimal parameter scenario, zero packet loss was achieved, and the throughput was improved by more than 5%.