Abstract: To study the trunk of cycas revoluta thunb forms bluriceps phenomenon naturally,from 2000 to 2002 in the base of flower garden in yichun Univerisity,the experment was carried out that the trunk or top of cycas revoluta thunb was grafted and split the top.the effect was obvious.The survival rate of graft is over 82.9%,the buds of the top aaverage 5—5.43 per blant,at most 10.