Abstract: The development of geotechnical investigation technology in recent years are summarized in this paper. Investigation technical characteristics for the recorded projects which including building, municipal, transportation, mining, water conservancy engineering are summarized, and especially emphases are laid on the projects under adverse geological conditions and the problematic soils. Nowadays, geotechnical investigation has much closer relationship with the engineering design and consulting, numerical analysis is widely used in the comparison and feasibility study of the foundation scheme, deep excavation and ground water control scheme at the investigation stage. The impact analysis for engineering construction and surrounding environment has been an important part of investigation report. The challenge and development opportunity of geo-environmental engineering is briefly analyzed, and investigation technical codes problem of the overseas project is also discussed.