This paper analysed the source and characters of Ke 4430-20 and studied 4430-20 as a elite parent and the production of the varieties developed from Ke 4430-20 the utilization of Ke The result indicated that Ke 4430-20 as one of elite soybean germplasm was used to develop 42 high-yield soybean varieties in Heilongjiang province. Among them, two varieties obtained the second-class award and the third-class award of Nation Science and Technology Advancement, respectively. Four and two obtained the second-class award and the third-class award of Heilongjiang Province Science and Technology Advancement, respectively. The result indicated that elite germplasm is very important for soybean breeding through promoting the efficiency of soybean breeding to select elite cross.