Abstract: (Plant Protection Institute, Heilongjiang Academy of Agricultural Sciences,Harbin150086) Abstract: Synthetic sex pheromones were used to study the dynamic occurring trend of soybean pod borer population in the field. The results showed that the occurring period of soybean pod borer was about one month in Harbin in 2006 and the fastigium period was from 7th to14th, August. This conclusion is roughly consisted with the data that obtained from traditional visual evaluation method by disrupting the moth in the field. Among 4 trapping methods used in this experiment, the water pot is better than the traps in effect of attracting moth. Adding little pesticide in the traps, the controlling percentage can reach 43.82% but it did not influence the controlling effect in water pot method. In 2007, synthetic sex pheromones were used to control soybean borer in Harbin as an exhibition, and 45.9% of moth could be controlled .Another similar exhibition were carried out in Harbin in 2008, controlling effect could be 50% using synthetic sex pheromones and traps together; while the controling percentage could reach 62.7% if adding a bit pesticide in traps.