Abstract: Heike 77 was cultivated through a combination of fast neutron radiation breeding and conventional breeding by Heihe Branch of Heilongjiang Academy of Agricultural Sciences. It is about 100 d from seedling emergence to mature growth in the adaptive area, and the required cumulative active temperature of greater than 10 ℃ is about 2 000 ℃.The plant is about 70 cm height with multiple branches, the 100-seed weight is about 9 g, and with high bean sprout creation rate. Results of average quality analysis in two years were 42.97% protein content, and 16.71% fat content. Identification results of disease resistance inoculation in three years showed medium resistance to gray spot of soybean. This variety is suitable for lower temperature region of the 5 th accumulative temperate zone and higher temperature region of the 6 th accumulative temperature zone in Heilongjiang Province. Through genealogical analysis, the cytoplasmic genetic composition of Heike was derived from Keshanbaimei and transmitted through Zihuasihao, Harvest 1, Heihe 54, Heihe 4 and Heihe 9. Heike 77 nuclear genes derived from three main parents were Japan Tokachi-Nagaha, Russia Youbilie and Minmax, and 5 native breeds in northeast China was Keshanbaimei, Suoyiling, Silijia, Yuanbaozhu, Zihuasihao as well as local varieties of different periods, respectively. The elite genes of round leaf and small seed of Heike 77 came from the male parent Minmax.The germination ratio of Heihe 77 was very significantly higher than Donong 690 and Heihe 43, suitable for sprout production, and has good economic benefits.