The paper introduced composition and on-line method,main functions and characteristics of CUG-2 drilling monitor with high precision and its application in ZK43-1 deep hole in Rushan of Shandong province.The practical application showed that CUG-2 drilling monitor with high precision can not only real-timely monitor,display and store drilling parameters,but also have some significant advantages such as forecasting hole accident and data wireless transmission,which has wide application prospect.