Abstract: This article chose the self-developed YQH-100-type oil-gas mixed pump as a research object, and selected the Mixture model, k-ε turbulence model and 3 schemes through adding "skirt" to different locations on the top of rotor vane to carry out the numerical simulation under the condition that the GVF were 0, 10%, 30%, 50%, 70%, and the performance curves of the oil-gas mixed pump under the three different "skirt" structure were plotted, respectively.The curves indicate that the second scheme(adding the "skirt" on the suction side) is better than the other two schemes, and the head is increased 1.92m and the efficiency increased by 0.34% than the original model, and making the gas distribution is more even.Therefore, the research can give some reference to the structural design of the radial clearance for the oil-gas mixed pump.