A telemetery system using computer technology was introduced in this paper．It was used for the supervision and management of the parameters of terrestrial heat exploitation well． By use of the telephonenet， the network of supervision and management was constituted． Therefore， the scientific level and automated level was greatly improved． Moreover， the DTMF signal produced by a telephone dial integrated circuit was used as the carrier of data and the existing telephone line was used as the transmission line when it was free in this longdistance communication． The investment of the system was cut down greatly．