Abstract: The dust tends to build up on the inner wall of exhaust gas pipeline of hot end system in dry ice expanded tobacco system, which affects the dynamic balance of exhaust fan, lowers the efficiency of heat exchanging system and even causes the self-ignition of the system, therefore the hot end system was improved by adding a third heat exchanger to raise heat exchanging efficiency, and an in site dusting system to clean the dusty air exhausted from the cooling vibrating trough. The results of application showed that at the technology air temperature of 350℃, the furnace temperature reduced from 770 to 750℃, the corresponding diesel oil consumption per kilogram of expanded cut tobacco decreased from 82.6 to 71.9 grams. In the case of that the price of diesel oil is 8.8 RMB yuan/kg, 136 thousand RMB yuan can be saved per year.