To ensure the construction quality of the Longxikou Navigation-power Junction project in Minjiang River,it is of great significance to well detect bedrock quality.This paper adopts geophysical detection methods such as drilling sound waves,drilling panoramic images,and borehole deformation modulus tests to conduct geophysical testing of the bedrock during the excavation of the foundation surface.The paper reveals the wave velocity distribution,fracture development,and deformation modulus of the dam bedrock,which provides a data basis for determining the final foundation surface elevation and has positive significance for saving project investment and construction period.