The contact pressure between the stator and the rotor of progressing cavity pump(PCP)is critical to its service life,and the interference between the stator and the rotor and the working pressures have an important influence on the contact pressure of PCP.A three-dimensional model of the PCP was established,and the finite element method was used to study the influence of different interference (from 0.4 mm to 0.7 mm) and working pressures (0.03 MPa,0.06 MPa,0.09 MPa) on the contact pressure between the stator and rotor of PCP under the assembly condition.The results indicate that the contact pressure between stator and rotor of the PCP increases with the increase of the interference,the contact area between stator and rotor also increases and the maximum contact pressure appears in the spiral section.However,as the interference increases,the increase in contact pressure becomes slower.The contact pressure of the PCP increases with the increase of the working pressure,the working pressure causes the maximum contact pressure of the PCP to shift to the discharge end,and the maximum value of the contact pressure appears on the spiral section near the discharge end of the medium.