Abstract: Site selection planning of abandoned dreg field during expressway construction concerns the economic benefits and the environment contamination et al..GIS has powerful space analysis function, such as space superposition and buffer analysis et al., which is helpful for site selection of abandoned dreg field.With Zhengjiaya tunnel abandoned dreg field of Yichang-Badong expressway as a case, remote sensing image processing and GIS were utilized to process relief map vectorially in site selection area to build Digital Elevation Model (DEM) of the selected area.Based on relative GIS spatial analysis including overlay analysis of remote sense image and DEM, and buffer analysis, the optimum site for site selection planning was selected, and the volume at the chosen site was calculated, which can hold the expected volume of abandoned dreg.This method with combination of remote sensing image processing and GIS provides new ways for site selection planning, and the research results have a practical value for improving the design and construction of expressway abandoned dreg field.

Key words: Abandoned dreg field, Site selection planning, Remote sense image, GIS