Amylose content of rice was negatively linear correlated with plant density under low nitrogen application,i.e.amylase content was lower when plant density increased.Whereas amylase content of rice was curve correlated with plant density under high nitrogen application.Amylose content was the highest when plant density was 13.4～16.0 hills/m².Protein content was curve correlated with plant density when nitrogen application was 0～135 kg/hm².Protein content was linear correlated with plant density when nitrogen application was 180 kg/hm².