Abstract: 【Objective】 Under different planting densities,through the analysis of agronomic characteristics and yields of different genotypes of maize inbred line materials,the density-tolerant materials and evaluation indexes of density-tolerance were screened to provide help for breeding of density-tolerant and highyield maize materials.【Method】 Using 68 inbred maize lines of different genotypes as material,two planting densities of 67 500 and 127 500 plants/hm2 were established to study the effect of density on agronomic and yield traits.【Result】 Using 18 phenotypic indicators such as plant height,ear height,stem diameter,leaf angle,and number of tassel branches,the density tolerance of 68 materials was comprehensively evaluated by the fuzzy membership function method. 2 parts of strong density material,19 parts of medium-density material,46 parts of weak-density material,and 1 part of non-density material were screened out. Then,principal component analysis and stepwise regression analysis showed that five indicators,such as yield per plant, bending performance,plant height,cob weight,and leaf angle were significantly correlated with the density tolerance of corn.【Conclusion】 2 strong density materials were screened,namely GAU630 and GAU810,and 1 non-density material was GAU669. The results of comprehensive principal component analysis and stepwise regression analysis showed that five indexes of yield per plant,bending performance,plant height,cob weight,and leaf angle could be used as evaluation indexes of maize density tolerance.