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Crop mapping is of particular importance for agriculture and irrigation management,researches have being carried out all over the world and remote sensing provides a promising alternative for crop area and distribution identification.In this paper, we use the MODIS vegetation data (NDVI and EVI) from 2000 to 2007 to explore the proper way for winter wheat planting area identification in Weishan Irrigation Area (WIA), where winter wheat is the dominant crop in spring.The spatial resolution is 250m, and the temporal resolution is 16 days.