The key of gas reverse circulation is the choice of blocking technology, through investigation and in-depth analysis. In this paper, considering the working environment of high velocity and large circulation pressure difference, a downhole stopper with the same body and different boreholes was designed, and the fluid flow and the wear of the stopper were simulated under the conditions of different inlet mass velocity and particle size. According to the simulation results of erosion, the strength of the stopper is analyzed. The following conclusions are obtained: with the increase of inlet flow and the decrease of particle size, the abrasion of the packer wall surface increases gradually. According to the requirements of tensile and torsional strength, the maximum safety torque of the stopper is 29 t/m, and the maximum safety tension is about 270t. The experimental results show that the new type of downhole choke meets the requirements of double-wall drill pipe reverse circulation.