Abstract: High-precision DEM data constitute the basis of watershed hydrology analysis.SRTM 1 Arc-Second Global elevation data, released by US Geological Survey, offer worldwide coverage data at a resolution of 1″ (30 m).In order to evaluate and analyze the potential watershed hydrologic applications of SRTM, the authors used Tanghe watershed in Hebi as the experimental area and airborne LiDAR DEM data as a reference to assess vertical accuracy of SRTM (1″) data and the impact of slope, aspect, land cover on errors of SRTM (1″).Hydrologic indexes based on the terrain, such as Topographic Wetness Index (TWI), Length Slope Factor (LSF) and Stream Power Index (SPI),were computed for analysis.Finally the basin's characteristic parameters, such as catchment basin area, longest path length, shape factor, curvature coefficient, were extracted from the two DEM data and the results were compared.Studies show that SRTM (1″) DEM data have high precision, the RMSE of the original data is 5.98 m, and the RMSE of the data with the elimination of the plane displacement is reduced to 4.32 m.Hydrological analysis shows that SRTM DEM and LiDAR DEM produce some different results: the average of TWI of SRTM is slightly higher, the average of SLF and SPI is lower and the dispersion degree is smaller.This is associated with the terrain distortion of SRTM DEM in micro-topography and high slope area.The basin parameters extracted from both of the DEM data have smaller differences, which shows that SRTM DEM (1″) has wide application prospects in hydrologic analysis.