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Telemetry monitoring is an important method to improve the efficiency of the new aircraft flight test, and to ensure the safety of flight test. The transmission capability and quality of the telemetry data determines the performance of the remote sensing monitoring. With a large number of aircraft in a flight test mission to carry out a wide range of performances, there are some limitations in the existing flight test single target telemetry system. In order to solve the problem of simultaneous telemetry data transmission, comparing of several common target system, this paper designs a system of multi - target telemetry data transmission system based on TDMA system. The data transmission rate and distance of the system are calculated.