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(A topology optimization design of TDMA inter-satellite link based on heuristic genetic algorithm is proposed to meet the measurement and data transmission service requirements of Beidou navigation system. Firstly, the basic principles of topology planning are formulated through theoretical analysis, and a topology framework that can meet most of the requirements is given. As the initial value, the topology is optimized by using genetic algorithm, in routing planning, the routing algorithm based on the principle of time division and the shortest delay is adopted. Finally, the measurement indexes of the inter satellite network are analyzed statistically. The data transmission between the satellites and the data transmission between the stars and the earth are taken as the typical conditions of the inter satellite network data transmission. The results of the logical simulation of the inter satellite network topology routing planning are verified. The simulation results show that the network topology planning can meet the requirements of the basic measurement and data transmission requirements. The topology optimization design provide a solution to the complex operation and management of the inter satellite network of navigation constellation.)