The fracture structure in the construction of the security and stability of site building has attracted attention.The cause of the fracture structure is complicated,different in size,different in depth,and the composition and character of the contents are very different.The fracture structure detection is lack of pertinence and intuition.Based on the analysis of regional geological conditions,we study the technical route and the method of detection,and use a variety of measures to detect the surface and the hidden of fracture structure.The detection results are intuitionistic and reliable,and can provide the detailed information of the macro safety evaluation of the engineering construction and the impact of the fracture structure on the engineering.Combined with the project of LNG wharf and rear yard engineering of the Yangshan Deepwater Port,the results are verified that the route and method of the detection technique can detect the fracture structure in the engineering site directly and pertinently.