The different water bodies and spectral characteristic of main ground objects in channal 1~7 in the upper reach of Changjiang River were analyzed using the moderate resolution imaging spectroradiometer(MODIS) image data. It is found that the mixed water body pixels in being the characteristic of visible spectrum with that of mountain and cloud shades and city have quite similarity. It is not good to identify mixed water-body only using the red and infrared bands. Normalized Difference Water Index (NDWI), Normalized Difference Snow Index (NDSI), and some band methods are used to progressively identify water body and mixed water body pixel.