In this paper, 95 combinations from the hybridization of 72 parents in common use, were used as materials to study the heredity of sugarcane defoliation traits. The result indicated that the female parents and combinations had significant effects on the proportion of 1 and 3 grades defoliation, while the male parents had significant effects only on the proportion of 3 grade defoliation. The average heritability sequences of the parents and combinations were combination(41.36%), female(30.13%) and male(12.02%), indicating that the matching way for sugarcane combinations is the biggest impact on offspring defoliation. So in the selection of parents and combinations, priority of the combination should be considered. The average heritability sequences of the proportion of all grades defoliation of the offsprings were the 3 grade(40.39%), the 1 grade(29.62%) and the 2 grade(13.49%). They were similar to the sequences of the proportion of all grade defoliation of the parents and combinations, indicating that the 3 grade defoliation is more easily transmitted to the offspring, the 1 grade is second, and the 2 grade defoliation is more difficultly transmitted to the offspring. In the matching of parents，females and combinations with high combining ability for 1 grade defoliation should be considered, and the parents and combinations with high combining ability for 3 grade defoliation should be avoided.