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In order to meet the requirements of large storage capacity, low bit error rate and reliable recovery in harsh environment in the field of reentry vehicle telemetry, and the shortcomings of traditional power supply and distribution mode, such as many ground equipment components, complex operation and low reliability, a low bit error rate digital telemetry system design method for reentry vehicle is proposed.The system adopts key technologies such as large capacity redundant backup storage design, low bit error rate design based on ECC error correction coding algorithm, high impact recovery protection design, etc., which improves storage capacity to 32GB,can continuously store 9h data, reduces bit error rate to 10-10, and realizes reliable recovery under high impact conditions; digital power supply and distribution technology based on 1553B bus, online fault diagnosis technology and other key technologies are adopted to simplify the ground test equipment and operation, save the development cost and improve the intelligence and testability of the aircraft. The system has been successfully applied to a certain reentry vehicle. It has passed the ground artillery test and flight test, and obtained complete flight test data.