Abstract: The flow coefficient of standing valve on sucker rod pump is an important indicator to assess the valve flowing performance and is also a necessary parameter to calculate the valve flow. At present, there are no special test and calculation formula for flow coefficient of standing valve. The Fluent software is used to simulate the process of fluid passing through the valve, analyze the distribution of internal flow field when fluid is passing the standing valve and analyze the effect of fluid parameters（density, viscosity, velocity）and valve ball opening on the whole process. The flow coefficient curves of standing valve were obtained at different openings, providing basis for computation of fluid flow into sucker pump on sucker rod pump.