Abstract: More and more screw pumps are being applied to oilfield,however,there still exist certain differences between it other general artificial lift methods in stability,reliability,and perfectness of matched technology.So a more convenient and feasible approach is needed to diagnose the pump operation.The development of screw pump comprehensive testing apparatus fulfills the need.It is based on based on single-chip microcomputer of MCS51 series.Synchronous or separate measurement will be achieved by regulating,receiving,and collecting signals through the serial communication of the single-chip microcomputer,as well as testing the polished rod torque,axial force,rotation speed,three-phase current,three-phase voltage,tubing head pressure etc.through the wired and wireless transmission mode.The new apparatus features in high accuracy,high sensitivity,and strong anti-disturbance,etc.,After being applied to more than 300 wells,it is found that the testing data are exact and reliable,with the successful ratio being more than 95%.This provides provide reliable basis for the working condition diagnosis and optimization of screw pump wells.