Abstract: For ordinary core extraction, common problems such as determining the length of the pile, distinguishing and judging severe honeycomb, continuous groove, fragmentation, and looseness in the concrete core sample of the pile body, determining the location and range of horizontal and vertical crack defects in the pile body, comprehensively determining the thickness of the pile bottom sediment, and determining the position and depth of the bearing layer karst cave were analyzed with the assistance of in hole camera technology, Furthermore, a reasonable and accurate judgment is provided for the defective pile. This article has certain guiding significance for the determination of defective piles in core drilling detection.