The problems existed in a open cycle synchronous control hydraulic system for two cylinder in a domestic wind tunnel were analyzed,the programme of open cycle synchronous loop with synchronous motor and reasonable unidirectional governor valve which could be responsible for flow compensation was finally adopted comparing the characteristic of some other hydraulic synchronous control schemes.The principle of the improved programme was elaborated in detail,and the matters needed attention in debugging were analyzed.Using the improved programme,good results were finally achieved in the actual operation.It provides draw lessons for the similar demand systems.