Tip The mutagens in the cigarette mainstream smoke collected by auTosmoking machine were determined. The results showed that BaP. tar, TPM, nicotine. 210 Po, Cd, and Pb were decreased in the maintream smoke filtrated by the filter tip.The decrease rate is 83. 9~93. 5%, 43. 3~54. 4%, 43. 3~53.7%, 17. 0~57. 5%. 56. 1~69. 3%. 72. 9~98. 25%, 53. 2~75.5% respectively. The fitrability in BaP,Cd,Pb and 210PO was respectively higher than that of acetate fibre filter group singnificantly. There was more active significance and use valne on decrea...