The beet armyworm, Spodoptera exigua (Hübner), is one of the most serious lepidopterous pests attacking maize, cotton, soybean and vegetables in the world. In recent years, the pest has caused significant economic damage to agricultural crops in most areas of China. The high levels of resistance to insecticides have led to chemical control failures. It is necessary that the alternative new approaches to control this pest should be researched and developed.Synthetic pheromones have been successfully utilized in controlling of numerous insect pests by using mass trapping, disruption of mating communication, monitoring and surveying. There were many successful examples against pests using sex attractant in China and the other countries in the past. Cis-9-trans-12-tetradecadienyl acetate (Z9,E12-14:Ac) and cis-9-tetradecenol (Z9-14:OH) are two major components of sex pheromone in Spodoptera. exigua, which can attract male months only when the two components are mixed together in a blend. The two major components of the artificial synthesis sex pheromone can be used to make binary lures by mixing them, which elicite all steps of the male behavioral sequences, such as searching for odor flume, oriented upwind flight and approaching lure source in wind tunnel. Effects of attracting were significantly different with various proportion and dose of the artificial synthesis sex pheromone in Spodoptera. exigua. Only the mixture of Z9,E12-14:Ac and Z9-14:OH with ratio of 7∶3 have the highest attracting activity among the five mixture with ratio of 9∶1, 8∶2, 7∶3, 6∶5, 5∶4 respectively. The amounts of males searching for odor, oriented upwind flight and approaching source by the blend of 7∶3 were the largest in those different ratio of components treatments, the attracting effects is corresponded to that of single virgin female. The dose of the artificial synthesis sex pheromone also has significant influence on the male attracting in Spodoptera. exigua. Though the sex attractants of Z9,E12-14:Ac and Z9-14:OH with dose of 0.05, 0.1, 0.5 and 1mg in 7∶3 have significant attracting effects, both the lower and larger dose of the sex attractant decreased the attracting efficiency. In field, the amounts of male moths to traps changed with the ratio of components of the artificial synthesis sex pheromone. The males being caught in traps baited with a ratio of 7∶3 is the largest which corresponded to those in wind tunnel. Furthermore, the total of males approaching lure source in wind tunnel was highly correlated to the amounts of males trapped with the same ratio of two major components of the sex attractant in field. The prospect of these results for application of sex pheromone to control the beet armyworm was anticipated.