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Abstract: In the inter-satellite network environment, the life cycle of the full link is not up to the expected standard value, and thus the transmission characteristics of the topology channel cannot be satisfied. Based on this situation, the inter-satellite link optimization method supported by the inter-satellite network topology technology is designed. In the network topology framework, the specific location of inter-satellite sensor nodes is planned, the mechanism conditions necessary for topology evolution are deduced, the ideal life cycle value of data information in the all-link organization is promoted, and the topology structure design of inter-satellite network is completed. On this basis, the basic structural form of inter-satellite link is studied, and the rationality of the processing optimization process is judged. Based on the specific optimization design, the conditions are established to complete the optimal design of static and dynamic links, and the conditions and processes of the optimal design of inter-satellite links are improved. Combine LDPC codes, construct standard inter-satellite check matrix, and process the decoding form of encoded data in the channel, so as to meet the transmission characteristics of topology channel, complete the LDPC coding of inter-satellite channel, and realize the optimal design of inter-satellite link based on inter-satellite network topology technology. The inter-satellite network environment was established for comparison experiments, and the data results showed that the maximum life cycle of inter-satellite link was increased to 135ms after optimization, WIT index value was always kept at about 70%, and the transmission characteristics of topological channel were satisfied.