Five disease-resistant upland cotton cultivars as paternal parents and four susceptible cultivars as maternal parents were used, and incomplete diallel crosses were made to analyze the combining ability of verticillium wiltresistance. The results indicated that Ji 122 and Zhongzhimian 2 had high positive general combining ability(GCA) in incidence, disease index, and relative disease index,while Jimian 616, Yumian 112, and Xumian 18 had the negative effects. Special combining ability(SCA) analysis indicated...