Abstract: In this paper, we successfully developed a test method based on the L300 series helium mass spectrometry of LEYBOLD to test the total leakage rate of spacecraft used to a non-vacuum accumulative helium detection method. After many tests, the results show that the as-developed spacecraft total leakage rate test system has high measurement accuracy and stable performance. It not only reduces the total leakage rate of the spacecraft system to a minimum, but also reduces the weight of the equipment and increases the mobility. It has some engineering applications and popularization values.

Key words: Helium mass spectrometry, Spacecraft, Total leakage rate test method, Leakage detection techniques