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To solve problem in the wind tunnel test process reliably, accurately control the semi-flexible nozzle system surface change, must make coordinated multi-axis synchronized motion electric putter. A continuous wind tunnel semi-flexible nozzle system as an example, Siemens T-CPU and S120 servo unit built hardware systems, acceleration and deceleration mode using the trapezoidal or S shape, to ensure synchronization with start and stop, and the value of the actual position in real time with the calculated values for comparison, coordinated synchronized movement of electric putter, so precise control of semi-flexible nozzle system surface changes. The test results show that the method can realize the semi-flexible nozzle in motion of multi-axis coordinated synchronized and ensure the safe operation of mechanism. The control system in the field of domestic wind tunnel semi-flexible nozzle is the first, the high efficiency and versatility theoretical methods can be widely used for any brand and model of servo control system to control the semi-flexible nozzle or full-flexible nozzle.