本文就Ｌａｎｃａｓｔｅｒ和唐四平头两大基础群体的组建、选系方法等论述了其在拓宽种质基础、目标化选育玉米杂交种中的重要意义，并对其选系作了配合力分析，筛选出一批在性状、抗病、配合力等方面均为优良的自交系，认为此种选系方法较为可行 This article discusses the important significance of broadening the germplasm base and targeting the breeding of maize hybrids based on the formation and selection of two basic groups of Lancaster and Tang Siping, and analyzes their combining ability, A number of inbred lines that were excellent in traits, disease resistance and combining ability were screened out, and this method of selecting lines was considered feasible