Two hundred and forty recombinant inbred lines （RIL） derived from a cross between japonica rice TD70 （with 1000grain weight of 80 g in 2011) and Kasalath, and its linkage map including 141 SSR markers was used to map QTL controlling grain shape traits（grain length, grain width, grain thickness）in 2010 and 2011. 18 QTLs controlling the three grain shape traits were detected on chromosomes 2, 3, 5, 7, 9 and 12, respectively, including 5 QTLs for grain length, 6 QTLs for grain width and 7 QTLs for grain thickness. Seven QTLs, namely qGL3.1, qGW2, qGW22, qGW5.1, qGW5.2, qGT2.3 and qGT3.1 were detected in two years and explained 56.19%, 442%, 29.41%, 10.37%, 7.61%, 21.19% and 17.06% of the observed phenotypic variance, respectively. The marker interval RM1347-RM5699 on chromosome 2 was common marker intervals of grain length, grain width and grain thickness；qGL3.1, qGT3.1 were mapped in the same interval RM6080-RM6832 on chromosome 3.All of the 18 QTLs alleles were derived from the large grain parent TD70. Most of the QTLs are cloned genes and some mapped QTLs. Three QTLs, qGL2.2 on chromosome 2, qGW9 and qGT9 on the chromosome 9 may be new sites.
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