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In the industrial process control, engineers generally obtain the controller parameters by trial and error method. This approach cannot help with certain blindness and the transient performance is less than ideal. In order to make the controller more efficient and practical, the plant model need to be identified accurately and get the PID controller parameters which coincide with the system controlled object. From the engineering applications as a starting point, by studing the PID self-tuning technical principles and practical engineering applications in depth, to achieve a step-based self-tuning PID identification of software development. And by changing the PID parameters, to verify the stability and accuracy of the software system.