The invention relates to a digital wireless transmission technique in geotechnical engineering. It comprises data sampling instrument, communication controller, GPRS IP Moden, public telephone net, Moden, TDRemote, major control computer sequentially connected to form on site equipment, partially realizing communication, control and data transmission through public telephone net and indoor major control composed of major control computer, TDRemote and Moden. It is simple, high in precision, stable in performance, low in error rate, easy for operation. It can fit for complex working environment, like poisonous, emitting, and contaminated and so on.