Abstract: In this paper a study both in theory and experiment is carried out on a pneumatic valve, it is seen that there shoud be a good match between the nmagnetic force and the load characteristics. The force is analysed by the network method, which is of higher precision than conventional method -when applied to solenoid having small air gap slits. Meanwhile a test installation has been introduced which is used to test pneumatic solenoid valves developed in Beijing Institute of Technology. There is a good accordance between the measured force and the theoretical value. According to the results propositions for the solenoid design have been put forward.