The maize hybrids were analyzed that were bred in Siping Academy of Agricultural Sciences in Jilin province.The result showed that Tangsipingtou,Lancaster,Reid Yellow Dent and Ludahongguzi are main genetic base of Sidan series maize hybrids.Firstly,the maize genetic base is Lancaster.The fourteen of thirty maize hybrids parents are Lancaster's and their derived inbred lines.Secondly,genetic base is Reid Yellow Dent.It is increasing and becoming important genetic materials.Recently,inbred lines improved from 78599 lines are being used in maize breeding.Maize hybrids of Sidan,Simi and Sizao played important role in China maize production and increased economic benefits.