Abstract: ESP pump efficiency is relatively low and energy consumption is relatively large, so it is of great significance to accurately predict the power of ESP pump for guiding equipment selection and on-site power grid configuration. The influence of crude oil viscosity on ESP system and power consumption is analyzed.When the viscosity of crude oil increases, the required pump power consumption increases. The operating characteristics and frequency conversion of ESP are the main factors affecting its power consumption. As a result, the actual power consumption of some wells deviates greatly from the predicted results. Based on the principle of energy conservation, the prediction method of power consumption of ESP system is deduced. The results show that this prediction method has a higher coincidence rate compared with the actual power consumption, which can provide a basis for energy consumption calculation and rational pump design of ESP.