In order to find out varying pattern in winter wheat's coleoptile length under mild drought stress,and verify the feasibility of wheat drought-resistant selection by an index of early stage,we studied seventy-two winter wheat varieties(strains) through 10% PEG-6000 to imitate drought stress,surveyed coleoptile length of these materials and classified them according to genetic distance by clustering analysis,illuminated causes of different performance in materials combined with single-grain weight index. The...