Abstract: To investigate if porcine DIO3 gene could be used as a candidate gene influencing some production traits of porcine, porcine DIO3 gene specific primers were designed and used in the radiation hybrid mapping. The RH mapping result showed that this gene was near to the microsatellite SW764 on chromosome 7. Seven QTLs for muscular fiber diameter, internal fat percentage, carcass length, carcass weight, and cortisol level, respectively, were found at this locus by searching pig QTL database. The results suggest that DIO3 could be a candidate gene for porcine meat quality traits, carcass traits and stress response.