Under condition of vibration,using the photoimpact generator and the conventional pulse-convertible counting method to measure the depth of hole drilled by rotary rig was of great error,and didn't achieve the accurate measurement. Based on the holedepth measuring and controlling system of Model ZWK-1 rotary rig which was developed by Changsha Institute of Mining Research,the new-type hole-depth measuring and controlling system after modifying its photoimpact generator is described,which can eliminate the vibrating disturbance to transducer and accurately measure the hole depth.