Abstract: he homozygous andromonoecy line TopMark served as male parent was crossed with the homozygous gynoecious line WI998 served as female parent during the experiment. The F1 derived from WI998 × TopMark was self-pollinated by single-seed descent（SSD）to obtain 171 F2S4 recombinant inbred lines（RILS），which was used to construct a SSR genetic linkage map. The resulting genetic map consisted of 19 linkage groups spanning 1 414.2 cM with an average marker interval of 10.2 cM. Total 9 QTLs of the first node on fertile flower were detected using the genetic map. These QTL were mapped on linkage groups 1，9，10，11，respectively. Their LOD values varied between 2.89–9.42. Four QTLs explained phenotypic variation more than 10%. Fp9.4 which was located in the 9th linkage group explained the highest phenotypic variation was 18.57%（2010 autumn，LOD = 9.17）. Also Fp9.3 which was located in the 9th linkage group（2010 spring 8.64%，LOD = 6.44；2010 autumn 17.99%，LOD = 9.42）and Fp10.1 which was located in 10th linkage group（2010 spring 3.59%，LOD = 2.89；2010 autumn 6.20%，LOD = 3.43）were both detected in the two seasons. The eight closed linkage markers（SSR01737、MU141991、TJ105、GCM206、SSR04910、MU173563、NR52、MU146331）can be used in fine mapping of the first node on fertile flower，which provides important reference anchors to the QTL in the future.

Key words: Cucumis melo L., SSR marker, genetic map, node of fertile flower, quantitative trait locus（QTL）