Abstract: The research is to study the trapping and control efficacy of tobacco Spodoptera litura by sex pheromone trap in order to provide a scientific basis for its widespread application in the tobacco field. In the flue-cured tobacco growing season, a field experiment was conducted to study the control effects of different densities, improved and homemade plastic trap bottles on Spodoptera litura, and the temporal dynamics of Spodoptera litura in flue-cured tobacco field was analyzed. The results showed that: two migration peaks of Spodoptera litura occurred during flue-cured tobacco growing periods; with the increase of trap density, the catches per unit area increased, while the catches of single trap reduced, and the dropping rate of Spodoptera litura population increased, and the maximum rate was up to 89.19%; the improved trap could significantly increase the trapping efficiency of sex attractant which could averagely catch 173.67 per trap, which was 57.34 more than that of the traditional traps with significant difference (P＜0.05); trapping efficacy was best when homemade traps with 4500 mL volume was used, and the average trapping number of each pheromone trap was 82.33. With its widespread promotion in Guangdong tobacco- growing areas, the improved traps are recommended as a carrier of pheromone, and trap density in the field with 7.5/hm2 is more suitable, and we should encourage farmers to adopt 4500 mL waste plastic bottles as homemade traps. Using sex pheromone could effectively control Spodoptera litura, decrease the application amount of pesticide, thus to reduce pesticide residues, and could be incorporated into the technical green control system of Spodoptera litura.