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A performance measuring system of agricultural products processing machine for testing the mechanical performance of rice mill and hammer mill was designed. The measuring system was designed based on mechanical devices, took an industrial control computer as host computer, PLC as main control unit and Kingview 6.5 as software development platform for IPC. It can measure in real time and display data of transducers of the measuring system. The system can analyze, process, display, output and store sampling data to get related main technical performance parameters of the tested machinery accurately and quickly. By performing experimental test and metrology verification, it is demonstrated that the system runs steadily and every specified control function has been implemented reliably. It should be highlighted that the measuring accuracies of mass, power and temperature are higher than the design demand by 0.5%,1.5% and ±1℃, respectively.