Abstract: According to the practical condition of primary processing line in cigarette factory,characteristics of PLC and common scheme of network configuration,a flavoring control plan based on internal model theory and implemented in PLC was proposed,which could dynamically modify the preset flavoring value.A differential precedence PID controller with intelligent integrator was devised to control casing pump,whose control performance was simulated by Matlab.The results of simulation showed that the differential precedence PID controller could keep in step with the change of preset flavoring value and featured good control performance.In practical application,the real time precision was over 99.6% and final precision reached 99.5%.Meanwhile,some aspects to be further studied were also proposed,such as the accurate calculation of flavoring rate and the position and angle of flavoring nozzle.