Abstract: The effects of rare earth elements on some leaf inclusion and leaf yield in seedlings of Ginkgo biloba were studied. The results show that by spraying 50?mg/L La(NO 3) solution on leaves of Ginkgo biloba seedlings, the content of soluble protein、soluble sugar and total flavonoid of the leaves was all markedly increased, respectively by 33.0%、29.0% and 48.6% more than the control. Treatment with 100?mg/L La(NO 3) solution was most effective on promoting the content of chlorophyll, the content of chlorophyll was increased by 16.8% more than the control, and the leaf yield was increased by 11.64% more than the control. 400?mg/L La(NO 3) treatment has a negative effect, the content of soluble protein、chlorophyll and total flavonoid of the leaves was respectively decreased by 26.7%、19.3% and 3.4% less than the control.