Abstract: Taking a cylindrical storage box as the research subject and based on the liquid capillary phenomenon under microgravity， a 3-D analysis model was established based on the Surface Evolver software. Using this model in numerical simulation， the free liquid surface’s climbing properties at the sector inner angle of the cylindrical storage box were studied under microgravity. The results of numerical analysis fitted the experimental results well， which confirmed the rationality and effectiveness of this method. By numerical analysis， the pattern of how the free liquid surface climbing was influenced by the contact angle and the container’s central angle under microgravity was studied. It was found that when the sum of contact angle between the liquid and the container wall is less than 90°， the liquid is constantly climbing， and when the container’s central angle is more than 50°， the liquid’s climbing height changes little.

Key words: Surface Evolver, numerical simulation, microgravity, free liquid surface interface, capillary phenomenon