Spacecraft orbit propellant filling system and method

The present invention discloses a spacecraft in orbit propellant filling system and method, after the exhaust gas using a first pressurized filling technique, such that the target does not need tanks and tank filling gas passage and connected to the fluid path at the same time , only a single fluid connection path, simplifying the docking mechanism; supply spacecraft need to install a pump to pressurize the filling, not only to avoid attitude disturbance torque generated by rotating the motor in the pump, but also by reducing the time of filling pressure stress, increase task reliability; before filling the target spacecraft propellant tank saturated vapor pressure relief to the following measures to ensure that the target spacecraft containers fill rate reached a higher level. Moreover, the system has a characteristic may be reusable spacecraft may supply a plurality of targets or a plurality of times to a target track in the supply, for the further embodiment orbit raise and services.