Abstract: The pressure correction equations of particle kinetic pressure and fluid pressure are established in which correction of particle volumetric fraction and fluid density is considered.The turbulent flow is represented by k k ε k θ p model,and the principle of momentum interpolation was applied to the covariant physical velocity components,which were chosen as the dependent variables in the simulation of the two phase flow field of impeller.It is shown that the calculations agree well with the practical matter,and the simulation method is performable.Also,it is shown that pseudothermal temperature on tension side is smaller than that on suction side,and pseudothermal temperature near wall is greater than that in the interior,Furthermore,pseudothermal temperature can be used to describe abrasion level.It supplies foundation for efficient design and property of blade pressure expander.