Abstract: At present, many single wells are limited by pump type, displacement, etc., it is necessary to ensure the stable operation of the well to further tap the potential, while the pump working conditions of various parameters must be regulated. Casing pressure control is a very important manner. By studying and analyzing the three-phase distribution state of oil, gas and water in the annular space of oil jacket, the casing pressure adjustment technology based on the real time monitoring system of pump working condition parameters was proposed, and then the pump inlet and outlet pressure data were fitted to obtain the pump efficiency comparison under different casing pressure sizes, and the reasonable casing pressure of oil well was determined by classification. Aiming at the well with high bottom hole flow pressure and always difficult to optimize in Penglai oilfield, this method can find the best working point of pump efficiency and reduce the bottom hole flow pressure, so as to achieve oil well stability and increase well production.