With the continuously development of deep and peripheral prospecting, a new type of deephole drilling rig matched with monitoring system of drilling parameters is required, and all hydraulictop head core drilling rigs will be the main drilling rigs for deep drilling in future. CUG-2 monitoring system of drilling parameter monitor was designed by China University of Geosciences to match the 2000m all hydraulictop head core drilling rig specially. This article introduced the design characteristics and testing parameters of CUG-2 system and emphatically introduced the parameters detection principle which was different to the principles for normal rotary drilling and shaftdrilling rigs as well as lectotype installation of sensors, including hole depth, drill speed, torque, horsepower and flow out rate.