According to the actual working conditions of the screw drilling tool, the circulating fluid (drilling fluid) is sent to the screw drilling tool by the ground reciprocating mud pump through the drill pipe string, and its displacement is relatively stable; The load at the output end of the screw drilling tool mainly includes the reverse torque formed when the drill bit breaks the rock at the bottom of the hole, and the friction torque formed by the weight on the drill bit acting on the support bearing of the screw drilling tool. According to this work feature, the basic principle of screw drill performance test can be put forward: input liquid to the inlet end of the screw drill through the circulation system. On the premise of keeping the circulating liquid flow of the screw drill at a given value, apply different torque loads to the power output end of the screw drill, so that the drill tool can work stably under different braking torques, and test the output torque T and output speed n of the drill tool under different working conditions, Circulating flow Q, drill tool inlet pressure P1, drill tool outlet pressure P2 and other parameters. After data processing and calculation, the characteristic parameter table and characteristic curve of the power drilling tool are obtained.