[Objectives] To optimize the biological control of the soybean pod borer, Leguminirora glycinioorella (Mats.) Obraztsov. [Methods] The effectiveness of different control methods for the soybean pod borer were compared to find the best method. The optimum application time was found by comparing the effectiveness of using sex pheromone alone, with that of using a combination of Trichogramma spp. and sex pheromones at different times of the year in Harbin and Heihe. A comparison of the effectiveness of using a combination of sex pheromone and different proportions of pesticide was conducted to determine the best ratio. [Results] The results showed that: (1) the effectiveness of a combination of Trichogramma spp. and sex pheromone was 60.89%, much better than that of using sex pheromone alone. (2) The two methods had the same optimum application time, which was five days before the peak of adult abundance. This achieved the best results for both methods of 62.42% and 66.08%, respectively, followed by application at the peak of adult abundance. Application five days after the peak of adult abundance produced the worst results. (3) Using traps and fumigants with 3/4 chemicals per 667 m² was better from multiple viewpoints, such as control effectiveness, cost effectiveness, and environmental friendliness. Although there was no significant difference in effectiveness compared to chemical pesticides, the new method can reduce pesticide use. [Conclusion] The best biological control method for the soybean pod borer is a combination of sex pheromone trapping and Trichogramma spp. deployed five days before the peak of adult abundance. A trap and fumigant with 3/4 chemicals per 667 m² can reduce the use of pesticides, and serve as a transition from chemical to biological control.