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Abstract:- The traditional method of application of remote sensing data for land cover mapping is the use of supervised classification and unsupervised classification. Decision tree, showing great advantages in remote sensing classification, is computationally fast, makes no statistical assumptions, and can handle data that are represented on different measurement scales. Decision tree classification has been successfully applied to many classification problems, but rarely applied to mapping of wetlands. In this study, decision tree was proposed to extract wetland from Landsat 5/Thematic Mapper (TM) imageries in a wide area of Yinchuan plain. Tasseled Cap (TC) transformation was used to identity the different wetland types and normalized difference vegetation index (NDVI) was computed to distinguish paddy wetland and lake wetland. Results from this analysis show that the decision tree has an outstanding performance compared with the supervised classification in maximum likelihood method. The overall accuracy of supervised classification is 64.60%, while that of decision tree classification was 83.80%. Besides, it appears that a decision tree combinations different useful knowledge is an effective and promising classification method