Abstract:In order to conquer the disadvantages of manual ultrasonic test as low efficiency,low precision and labor intensity,an automatic flaw detecting and sorting system for aluminum shaft was designed.Then mechanic structure,hardware structure,software system of this system were discussed in detail.On the base of combination of IPC and PLC,IPC was taken as the upper computer to fulfill man-machine interacting and date collecting and analyzing,and then PLC was in charge of the automatic control process.Aluminum shafts were transported to test area,and were tested one by one.At last these shafts were sorted according the defects were existed or not existed in the discharge area.This system can improve the reliability and efficiency of aluminum flaw detection and deduce labor intensity.