Abstract: Three cultivars of sweet Osmanthus,Osmanthus fragrans ‘Liuyeyingui’,‘Shangui’ and ‘Sijigui’ were studied on the increment,flower output and the change of mineral nutrient.The results showed:(1)The differences of total increment and flower output were remarkable among these three cultivars.They ranged in total increment from‘Liuyeyingui’ to ‘Shangui’ to ‘Sijigui’,while in flower output per year were from ‘Liuyeyingui’ to ‘Sijigui’ to ‘Shangui’.(2)The content of different mineral had changed differently.K,Ca,Mg,Fe,Cu appeared a change of a single peak:the content of K,Ca,Cu reached the peak value at April while Fe and Mg at August;the annual changes of the content of N and P had two peak value at April and October.On the other hand,Mn and Zn changed differently with a single peak and a double peak respectively.