Abstract: In order to homogenize the quality characteristics of rice, rice grains were fractionated by kernel thickness and then separated by kernel specific density. Results indicated that if moisture content of rice was less than 20%, rice grains with different moisture content could not be fractionated by kernel thickness and separated by kernel specific density. Milling quality, physical and chemical properties and pasting characteristics of rice with greater kernel thickness and specific density were better than those of rice with less kernel thickness and specific density. The greater kernel specific density was, the lower broken rate was, and also the greater maximum three-point breaking force was. Rice grains are graded through kernel thickness fractionating and kernel specific density separating according to quality of rice grains and the quality of rice is also homogenized, so added value of rice with high quality is increased.