Abstract: Combined with the engineering example，the low strain reflected wave method is applied to the pile foundation survey，and the identification and judgment method of the detection waveform signal are analyzed and studied.This paper describes the basic principle of low-strain reflected wave method for pile foundation detection，designs the test system，selects the position of the sensor and the excitation point，and puts forward the method of eliminating the shear wave interference at the top of the pile.Through the collection，analysis and processing of the engineering site data，the quality of the pile foundation is determined，and the rationale for the construction work and the site operation of the construction site is given.The results show that the low strain reflection wave method is very high accuracy，has a very good application prospects，which is better to guide the mine pile geotechnical exploration and construction work plays a very important role.