Heredity of some characters in F 1 generation by the 26 cross combinations among 30 varieties of Dendranthema grandiflora was studied.The results showed that crown head and stem height of F 1 plants were weaker than the parents′ mean value.The hybrid′s mean crown head and stem height were 63 2% and 71 8% of parents respectively,and declined from 71 6% to 49 3% and 76 5% to 63 0% respectively as the parents′ mean value increased,but the over parent individuals still emerged due to the large vari...