There were 29 major commerce soybean cultivars in Jilin province during 1975~1995. The cultivars may be devided into four groups: middle and middle-latemiddle-earlyearly and determinante. The relations of replacement and genetic were analysed for the cultivars in each of four groups. In middle and middle-late groupmain genetic systemcomposed by Jilin 3 and Jilin 4-Jilin 8 and Jilin 20-Changnong 5 and Jilin 27 was developed. There were four minor genetic systems: Jiunong 9-Fengjiao 7607, Jilin3-Changnong, Xaojinhuang 1-Jilin 8, Qunxuan 1. In main and minor systemdecline phenomenon existed that production area of later period variety was less than that of early period variety. In middle-early groupthere was no obvious main-system. Inearly groupthere was Fengshou 10-Hefeng 23-Hefeng 25 main systemShuinong 4 and Jilin 26also had blood relationship of Fengshou 6. In determinante groupthere were two main system of Zhaofeng 1-kaiyu 8 and Tongnong 3-Tongnong 5tongnong 6- Tongnong 9Tongnong 10. Jilin 18 Jilin 20, Chagnong 4 had 1/4 introduction germplasm in blood relationship composition. Jilin 21 Jilin 27, Fengjiao 7607 had more than 1/4 introduction germplasm. Changong 5 only had 1/8 introduction germplasm. The cultivars that included 1/4 introduction germplasm possessde larger planting area. Soy-bean breeding program that on the basis of possessing 1/4 in troduction germplasm, suitable germplasm which was more complex and better should be work out.