In order to study the amylose content of 28 tetraploid glutinous rice materials,samples were sent for inspection,the results showed that two of the three full-index test materials met the excellent standard.Another 25 parts of amylose single test,amylose <1.5% of the 5 parts of the material was basically reliable,which was worth the target material; its amylose> 2.0% of the three materials were not high quality japonica; 17 materials with 1.5%≤ amylose≤2.0% reached the quality standard of high quality japon...