Abstract:After application of global position system—GPS technology,appearance of 3D laser scanning technology is an important technological revolution in surveying and mapping field. It can be widely used in many fields including survey of engineering constructions and interrelated 3D measurements,and has unique characteristics of the high efficiency and high degree of accuracy. At present this technique is still under the initial stage in other countries,and is also quite rarely used home,especially in geotechnical engineering and geological engineering. On the basis of simple and overall introduction of 3D laser scanning technology,the paper studies how to apply the technology to high and steep slope investigations according to a case study;and principles and methods of slope quick logging and rock mass structural plane parameters measurement are discussed and analyzed. Therefore the conclusion can be draw from the analysis that application of 3D laser scanning technology to geotechnical engineering and geology has a great prospect and value.