Abstract: To reduce the temperature fluctuation of output tobacco, feedforward control was adopted to sustain a stable high temperature and high humidity atmosphere in the casing cylinder, and the tobacco temperature control system was modified as following:1) Installing a nozzle device for introducing steam at low velocity to create a high temperature and high humidity area evenly in the front part of casing cylinder to ensure that tobacco was uniformly heated. 2) Applying steam at a fixed rate and adopting servo cylinder to adjust the hot and cold air valves to ensure that hot air temperature was stably controlled. 3) Adjusting the slope of discharge slide plate to improve the accuracy of tobacco temperature detection. The results of application showed that the deviation between instrument reading and measured value of tobacco temperature reduced from 1.21 to 0.04℃ and that between measured and setting values decreased from 1.05 to 0.11℃. The fluctuation of output tobacco temperature was diminished and the stability of temperature control system was guaranteed.