Abstract: In view of problems of tedious operation procedures, needing long time for steady drilling, low accuracy of traditional manual measurement method for calibration of borehole opening azimuth and tilt angles, a calibration system of borehole opening parameters based on ultrasonic principle was designed. The system uses ultrasonic transit time detection method to measure distance between reference points, calculates azimuth angle by single-chip, and selects micro-mechanical triaxial accelerometer to measure tilt angle, which achieves fully automated, real-time tracking and measuring and intelligent voice guidance for rig attitude adjustment. It realizes fast calibration for necessary borehole opening parameters within tolerance limits. The system improves accuracy and efficiency of calibration of borehole opening parameters, as well as mine management level, while reduces labor intensity and mine management cost.