At present,there is increasing demand for black rice because it has good rice taste and medicinal value,but low yield is the main influence factors of the large-scaled popularization.The relationship between source and sink of black rice was studied under five different densities with black glutinous.The results indicated that density had significantly（0.01 or 0.05）obvious positive correlation with the total number of spikelet and leaf area index of each growing stage,density and gain/leaf area ratio at heading stage has significantly（0.01）obvious positive correlation.Therefore,the moderate increase of density can improve the quality of source and sink,which significantly affects the yield by increasing the leaf area index and the total number of spikelet.