Abstract:The karyotypes of A.hypogaea(six cultivars)and two natural speciesin genus Arachis are reported in this paper,and their karyotype formulaeare as follows:Jiangban,Kaifeng Yizuorang,Fu Huaseng,Balsa 1016and Xiyang Seng 2n=40=38m+2sm(SAT);Silihong,2n=40=38m(2SAT)+2sm(SAT);A.cardenasii,2n=20=18m+2sm(SAT