Abstract: In order to reveal the relationship between the development status of high quality japonicarice Qijing10 at booting stage and the rice yield at maturity stage,this paper measured the plant height at booting stage,tillering at booting stage and SPAD value of canopy leaf at booting stage of Qijing 10,and analyzed the correlation with yield.The results showed that,the yield per plant was significantly positively correlated with the height of the plant at booting stage,the number of tillers at booting stage and the SPAD value of the top leaf at booting stage.Finally,the nutritional diagnosis value（NDC）and the yield prediction equation based on the nutritional diagnosis value at booting stage were obtained through optimization,NDC=plant height×tiller number×SPAD2÷10 000,the yield prediction equation based on the nutritional diagnostic value at booting stage was finally fitted,the yield per plant（g）= 8.9×NDC-48.9,and the determination coefficient was 0.795.