Sewage pump wells common fault sucker rod off, serious pipeline leaks, tubing serious wax, sewage pump stator off, screw pump stator wear and tear, loss of oil wells, sewage pump stator swelling, the working parameters set low, the working parameter bias high. The characteristics of its performance in the torque, axial force, current, submergence, hydraulic, nesting, liquid volume and other parameters change. (1) The specific performance of normal conditions: pump efficiency, submergence, current and other production parameters in the normal range. The system is stable, the parameters have not fluctuated greatly, the working torque and axial force are steady and straight, and the torque value is within the normal range. (2) The detachment of sucker rod is manifested in the following aspects: in the short term, the pump efficiency drops sharply, the dynamic liquid level rises rapidly, the current drops or even approaches the no-load current, and the oil pressure varies. Torque and axial force is still a smooth straight, bare lever torque value is far less than the normal working range, axial force is also less than the normal range. (3) The specific form of pump leakage is as follows: the pump efficiency is gradually decreased, the dynamic liquid level is gradually increased, the current is gradually decreased, the torque value is lower than the normal range, the axial force is lower than the normal range, Weight, oil pressure to a certain extent connected. (4) Stator swell failure performance for the pump and the normal liquid level, the current increase. Polished rod work torque increases beyond the normal range, axial force normal. (5) The performance of stator degumming is the drastic drop of pump efficiency, the rise of dynamic liquid surface, the drop and fluctuation of electric current, the drop of polished rod torque, the irregular fluctuation of polished rod torque. The axial force of polished rod is lower than the normal range, The weight of the column in the production fluid. (6) The tube leakage is characterized by a decrease in pump efficiency, a rise in moving fluid level, a decrease in current, a lower lever torque value below the normal range, and a slightly lower axial force on the polished rod than the normal range, but still higher than the rod's weight in the fluid. (7) Tubular wax is manifested by the increase of dynamic fluid level, the decrease of pump efficiency, the increase of current, the value of torque higher than the normal range, irregular fluctuations and low axial force, but still in the normal range. (8) The high operating parameters are mainly low pump efficiency, deep liquid surface, submergence or even close to the pumping population, the current is also high, the polished rod torque value is higher than the normal range, the axial force is higher than the normal range. (9) The low working parameters are high pump efficiency, shallow moving liquid level or low current in the wellhead, the torque value of the polished rod is lower than the normal range, and the axial force is normally low. Then through the extraction of these characteristic parameters, theoretical analysis and field verification. Combined with the production data of oil wells, a set of comprehensive analysis and diagnosis methods can be formed to make the analysis and diagnosis technology of sewage pump go from qualitative to quantitative, and the oil wells can be maintained and treated in a scientific and timely manner to extend the inspection pump cycle.