With the modern industrial and civil construction,increasing the degree of geological survey as the most basic link,only to do all the geological survey work in order to ensure the safety and quality of the building,in order to enable the project to proceed smoothly.By analyzing the characteristics of geological survey of the construction works,to the soft ground,for example,to explore for its survey techniques and survey process should pay attention to the problem,this article described for us in the engineering practice in the future a better grasp of geological to design a more reasonable construction program to provide a theoretical draw.