The QTLs for some grain characters including grain length (GL), grain width (GW), grain thickness (GT), grain volume (GV), grain length to width ratio (GLWR) were analyzed with Xieyou 9308derived recombinant inbred lines (RIL) population as material by using its molecular genetic linkage map across three environments. A total of 26 QTLs were detected on chromosomes 1, 2, 3, 4, 6, 7, 8, 10, 11 and 12. Among the QTLs detected, 4 QTLs for GL explained 3.98%-54.58% of the phenotypic variation; 4 QTLs for GW explained 6.98%-9.88% of the phenotypic variation; 8 QTLs for GT explained 4.91%-11.92% of the phenotypic variation; 5 QTLs for GV explained 5.07%-22.35% of the phenotypic variation; 5 QTLs for GLWR explained 5.17%-47.81% of the phenotypic variation. Six QTLs could be detected in two or more environments. qGL3.1, qGW3.2 , qGV3.1, qGLWR3.1 could be detected across three environments, suggesting that these QTLs were less affected by the environment and were stably expressed in multienvironments. QTLs for GL, GT, GV and GLWR could be detected in the interval RM6283-RM7370 on chromosome 3, suggesting that the genetic effects of QTLs for related traits existed pleiotropic effects. A total of 5 QTL pairs with additive × additive epistatic effects for 3 traits (GW, GT, GV) were detected, explaining 108%-3.00% of phenotypic variation. Combined detection showed that additive ×environment interaction effect of the QTLs for grain shape traits was detected, but all of those effects were so small and explained small phenotypic variation，suggesting that rice grain shape traits were geneticly stable.
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