According to the mutation in exon 7 of Badh2 (Betaine aldehyde dehydrogenasegene) in fragrant rice,we designed a functional marker YY5-YY8,which can be used to check rice materials with this mutation or not.Other two reported markers for exon 2-mutated and exon 4 or 5-mutated types of Badh2,InDel-E2 and FMbadh2-E4-5,were also used to analyze the mutations of Badh2 in 80 fragrant rice materials from different ecological regions.It showed that 26 fragrant rice materials were of the exon 7-mutated type,37 fragrant rice materials were of exon 2-mutated type and none of them was found to be of exon 4 or 5-mutated type.This study constructed a new molecular marker YY5-YY8 for checking the mutation of Badh2 and identified the mutation types of these fragrant rice varieties for breeding high quality fragrant rice.