Abstract:For detection of hydraulic cylinder synchronization requirements, the real time control system based on LabVIEW was built. In this system, DAQ card was used to realize the realtime detection of the two oil cylinders displacement; though incremental PID and control card, the closedloop control to the slave cylinders displacement was realized, so as to ensure the slave cylinder tracking the master cylinder all the time, to achieve the synchronization control purpose. Test results show that the masterslave control system can be used to control the displacement of the cylinders well, the synchronization precision is high, the actual use requirements are met fully.