Aiming at the disadvantage of traditional hydraulic cylinder testing system, such as old measure, low detection precision, etc.,a new control-strategy to checkout property of tested cylinder was proposed. The new strategy succeeded to modularize the tested property and organically combine tested properties of cylinder together during hydraulic cylinder moving. The new real-time testing system made use of the technic of PLC(programmable logic controller), CoDeSys configuration and Visual Basic 6.0. The test results indicated that the real-time testing system made hydraulic cylinder properties be inspected successfully; test data and curve could be printed out, and increased testing efficiency.