Abstract: In the gravity field,the state of fluid in the tank is known,which is based on the law of hierarchical distribution. While under the circumstance of microgravity,the state of fluid in the tank is unknown. And the distribution of gaseous phase and liquid phase is irregular. So the geometrical shape of the interface is unsure. This paper uses VOF method to simulate the liquid hydrogen storage tank under the circumstance of microgravity,which mainly considers the influence of different factors,such as gravitational acceleration,contact angle and different working fluid filling. Thus the numerical simulation can summarizes the principal factor on the gas-liquid interface in microgravity.