Abstract: The conditions, such as the existence of collapsing losses, aeolian sand, seasonally frozen soil, and so on, make geotechnology become very complex in using water of the Yellow River to enlarge irrigation areas of Guyuan and Haiyuan counties through the sixth trunk dyke. So, in order to find out the engineering geological property of these special rock and soil, a large of spot and soil and extrapolated the existing problems of geology, and still brought forward corresponding treating measures of engineering.