Abstract: The progress in products' harm reduction in tobacco industries at home and abroad since 2004 was reviewed in terms of cigarette blend,processing technology and auxiliary materials,especially in processing technology.It was believed that harmful components reducing in cigarette smoke was a systemic engineering and should be studied systemically and intensively,and stressed on cigarette formulation,processing technology and auxiliary materials,not only their effects on harmful components in cigarette smoke but also their effects on toxicological index and smoking quality of cigarette smoke.The research and developments of any additives aimed at harm reduction should include the following aspects:safety evaluation of the additive,analysis of harmful components and additive components in cigarette smoke,reducing of harmful components,analysis of the pyrolytic products of the additive,sensory evaluation and toxicological assessment of cigarette smoke.