Abstract: Abstract:Objective To study the mortality trends of lung cancer from high incidence areas of Yunnan province, providing basis for local lung cancer control effect evaluation and formulation of measures. Methods The information on the lung cancer mortality in the Xuanwei City and Gejiu City in Yunnan province was collected from 1973 to 1975,from 1990 to 1992 and from 2004 to 2005.The level of lung cancer mortality, increase trend and the changes of malignant tumor mortality in the ranking was analysed,respectively. Results The lung cancer military in creased from 0.0282% to 0.08328% in Xuanwei City,while decreased from 0.04365% to 0.02484% in Gejiu City,respectively,from 1973 to 2005.From 1992 to 2005,the growth rate of lung cancer mortality in Xuanwei City is 5.74%,which is higher than that (1.90%)from 1973 to 1992(P<0.01).From 1992 to 2005,the growth rate of lung cancer mortality is -5.17% in Gejiu City,which is lower than that (0.67%)from 1973 to 1992(P<0.01).The lung cancer mortality rate among malignant tumor mortality in creased from 46.5% of 1973 to 58.44% of 2005 in Xuanwei;while decreased from 48.29% to 43.54% in Gejiu. Conclusion The mortality rate of lung cancer in Xuanwei city shows a tendency of rapid increase, especially in the latest decade; but the mortality rate in Gejiu City decreases evidently after prevention.