Abstract: In order to explore the relationship between cause of coke sweet aroma in tobacco leaves and climatic factors, correlation, regression, and discrimination analysis were conducted for aroma of C3F tobacco leaves from 15 locations in China. The results showed that there was significant relationship between coke sweet aroma and extreme high temperature, extreme low temperature, sum rainfall, average temperature, sunshine hours, maximum wind speed, and minimum relative humidity. The strength influencing coke sweet aroma type was, in the order of decreasing, extreme high temperature >extreme low temperature >sum rainfall >average temperature >sunshine hours >maximum wind speed >minimum relative humidity. The discrimination analysis results predicted the predictors both correctly based on such 7 climatic factors. So some methods could be taken to improve the tobacco quality and style during the tobacco production.