The normal operation of the Three Gorges ship lock’s herringbone gate opening instrument is an important guarantee for the safe and efficient operation of the Three Gorges ship lock.There are a series of problems in the opening instrument used in the herringbone gate of the Three Gorges ship lock,such as the spare parts cannot be purchased due to production suspension,the maintenance and construction procedures are complex and time-consuming,the maintenance and replacement costs are high,and the operation state is unstable.In view of these situations,the programmable logic control technology and computer monitoring technology are used to study the application of laser radar sensed gate opening instrument in Three Gorges ship lock.The practice shows that the measurement data of the laser radar opening instrument are more consistent with the measured data of the built-in opening instrument,the laser radar opening instrument meets the requirements of the core control technology of“synchronous opening and closing” and “centering closing” of the herringbone gate of the Three Gorges ship lock.