Abstract：Abstract: To understand the genetic basis of seed setting (SS) in rice, genotype by environment (G×E) interaction and QTLs for SS were analyzed using a population with 202 recombinant inbred lines (RIL) derived from a cross between 2 indica varieties, T226 and T219, under eight different environments. Significant G×E interaction for SS in rice was detected using AMMI statistical model, and the IPCA1 and IPCA2 of G×E interaction explained a total of 57.6% of the variation. QTLs controlling the SS were detected by interval analysis, and a total of 17 QTLs on 9 chromosomes were identified across eight environments, explained the phenotypic variances from 4.6% to 35.7%, respectively. Most of the QTLs were detected in one or two environment, explained small part of phenotypic variances. While a QTL（qSS3-1） on chromosome 3 detected across six environments, explained maximum phenotypic variances in each detected environment and its allele for increasing the SS was derived from T226. The QTL (qSS5-3) on chromosome 5 was detected in 5 environments, however Its allele from T219 increasing the SS .
