Abstract: Twelve winter wheat cultivars that were widely planted in South Huang-Huai region were used to study their grain filling characters.Conclusions were obtained as follows: Significantly positive relationships were found between mean grain filling rate, maximum grain filling rate and 100 grain weight, kernel volume, kernel maximum volume.It was grain filling index, not 100 grain weight, that had significant relationship with grain filling duration.Among the cultivars used, Zhcngzhou 853, Shannong 7859 had the biggest mean grain filling rate and maximum grain filling rate, with the shortest grain filling duration.They belonged to the genotype of late flowering.The grain filling durations of Ji 5418 and Xuzhou 21 had the longest grain filling duration, and they belonged to the genotype of early flowering.In addition, the suitable grain filling pattern in South Huang-Hai region was also discussed.

Key words: Wheat, Grain filling rate, Grain filling duration, Degree-day