In order to study the effect of blade consistency on the maximum effective static pressure rise of a single-stage low-speed compressor， a compressor model with different blade consistency is constructed by changing the number of rotor stator blades. The compressor characteristics under different consistency are obtained by using three-dimensional numerical simulation method. The results show that the increase of stator blade number can inhibit the boundary layer separation， delay the compressor to enter the numerical stall， increase the pressure ratio near the stall point， enhance the maximum pressure rise capacity of the compressor， and increase the maximum effective static pressure rise； the increase of the number of rotor blades can inhibit the flow separation and reduce the flow loss， so as to reduce the pressure drop in the low flow condition with the increase of compressor efficiency and pressure ratio， the ability of pressure rise near stall point increases， and the maximum effective static pressure rise increases. By comparing the maximum static pressure rise coefficient of each compressor with Koch correlation curve when the number of blades is different， the effectiveness of using the maximum static pressure rise as the compressor stability criterion is verified from the perspective of numerical simulation.