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It is difficult to control the integrating chemical process, and in order to improve the stability of process and solve the problem of parameters adjusting of the controller. In the paper, a tracing setpoint controller and a load-rejection controller are designed to control the integrating chemical process, so the tracing setpoint control loop and load-rejection control loop can be adjusted independently. On the basis of optimal control theory and Taylor approximation, the tuning parameters of the resulted PID controllers can be given analytically,furthermore the stability analysis of the closed loop control system is also given, which shows that the designed system can track setpoint without error. At last, the application examples show that the proposed method has superiority over some existing methods, and it can be used to control integrating chemical process.