The new hybrid soybean, Hybsoy-2, was used to discuss the reasonable population structure of hy-brid soybean with 5 different density test by studying the yield, yield components, leaf area and dry matter accumula-tion. Results showed that the appropriate density of Hybsoy-2 was 170, 000 to 220, 000 plants/hm² in the central re-gion of Jilin Province. The maximum leaf area index was up to 6.06~6.47 and the photosynthetic production ratewas 8.80~9.90 g/m²·d at the pod stage. While the leaf area index was still remained at 4.70~5.96, and the averagephotosynthetic rate was 5.10~6.40 g/m²·d at seed formation stage. The production with this density could reach 3319.40~3416.70 kg/hm².