Abstract: Using‘Liangyoupeijiu'as control(CK),the hybrid rice,‘Fulongliangyou29',was employed to study the sink/source relationship,as well as the correlation between the rice grain formation and the chlorophyll content and leaf area index of the plant.The results showed that the chlorophyll in ‘Fulongliangyou29'decreased at a higher rate than that in CK,while the leaf area index and chlorophyll declining ratewere not significantly different from those of CK during the entire late growthperiod;and,therice yield and growth rate were lowerduring the early stage,but greater than those of CK in the late stage.Since thesink capacitylargely determined the yield on ‘Fulongliangyou29',appropriate measures should be implemented to strengthen itfor the cultivation ofthe hybrid rice.