R wave has characteristic dispersion in layered media. R wave velocity is mostly relative to the nature of media in which wave can penetrate. Based on the close relationship to S wave, R wave can be used to measure geotechnical features. There are some limitions in the early exploration method of R wave. This paper developed the multichannel transient R wave exploration technology. We have carried out a lot of experiment on instrument selection, measurement system design, data collection and processing. In geotechnical engineering survey and evaluation of foundation treatment we have achieved good results in practice.