By employing a recombination inbreed line (RIL) population of 247 lines derived from an inidca-inidca cross Zhenshan 97Bx Milyang 46, a linkage map consisting of 250 DNA markers was used for QTL mapping of plant height, maximum root length, root dry weight and relative water content under normal and salt stress (0.7% NaCl). Six QTLs for these traits were identified under salt stress, with 6.01%-16.50% phenotypic variations. Six QTLs for these traits were identified under normal conditions, with 4.39%-18.50% phenotypic variations. Meanwhile, root length and relative water content were simultaneously affected by two QTLs located in the interval RM246-RG101 on chromosome 1 and the interval RZ399-RG393 on chromosome 3.