Germplasm basis and heterosis model of maize varieties were analyzed in this paper which passed appraisal in the past 20 years in Jilin Province.The results showed that the germplasm resource could be mainly classed into ’Improved Huangzao 4’,’Improved Reid’,’Lancaster’,’Lvda red cob’ group and P78599,etc.Majority of inbred lines were the recycling maize inbred lines.The main heterosis models were improved Huangzao 4 × improved Reid,improved Huangzao 4 × Lancaster,improved Reid × Lvda red cob,Lancaster × improved Reid,P78599 × some of them.The genetic basis of maize breeding in Jilin Province was still narrow at present.The breeders should improve cooperation on germplasm resources,apply to recycling breeding strategy and constantly innovate the maize breeding of Jilin Province.