Abstract: This paper indicated that the deep cover exploration techniques and methods used in Dadu River anninghydropower feasibilities: φ130 plant gum drilling technology, φ139 thick-walled tube with the tube drilling technology, multi- level drill with drill pipe into the processes; and also described the cover drill hole next to the pressure tests and the original sand sample taken technology. The exploration in deep cover on the application of technologies and methods had ensured the successful completion of exploration work. For detailed calculations, designs, reliable and comprehensive parameters, It also improved exploration technology to improve the level of exploratinn for future work