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In view of the important role of BDS in space information transmission, Combined with the development status and application requirements of spacecraft in China, the spacecraft space-based TTC based on BDS is studied. This paper introduces the composition and application prospect of BDS, discusses the great advantages of space-based TTC in improving the measurement and control capability of spacecraft, the construction and development status of space-based satellite resources in China and abroad are introduced. This paper presents the composition model of spacecraft space-based TTC based on BD, and presents the three key technologies of " extend service access", " high-speed data transmission" and " information security transmission" to be solved according to the characteristics of BDS and special application requirements of spacecraft .Finally, the spacecraft space-based TT&C test is introduced .