Abstract:Hydraulic cylinder test bed was developed according to the test standard of hydraulic cylinder and the deficiency of the existing hydraulic cylinder test bed. It was designed for the type test of the maximum cylinder diameter of 320 mm and the longest stroke of 1 500 mm and the maximum rated pressure of 16 MPa. In order to decrease the equipped power of this system and to meet the measured cylinder test demand for loading force and to improve the testing efficiency, high/low pressure pump, proportional loading system and synchronous positioning system were used in the hydraulic system. A new type test bed of variable stroke and accuracy positioning and locking by hydraulic was designed according to the test requirements of different diameter, different stroke of the measured cylinder. ANSYS was used to analyze the strength of the structure. In the end, issues encountered in the process of installation and debugging were dealt with. Practice has proved that the design of the test machine is successful by using the machine in the real test of hydraulic cylinder diameter of Φ200 mm.