In a liquid rocket propellant feed system，tank pressure is an important parameter
which should be strictly ensured．The pressurization system becomes oIle of the key systems influ·
encing the reliability target，therefore numerical simulation and ground test are needed in order to
optimize its design．The pressurizing process of certain propellant feed system is simulated by
AMESim．The result of the simulation has a good agreement with the test，and indicates the validity
of the buffer．Besides above，the pressurizing time should be more than 1 7s．