By studying the dynamic characteristics of Flexibility Nozzle of the Motor Thrust Vector Control, develop a experiment device that can reflect dynamic characteristics of the Flexibility Nozzle in the state of the omni-axial movable veritably. Two sets of output shaft of the angular displacement sensor are grouped together by the cross, orthogonal configuration, then the linear displacement sensor picks up a set of output shaft of the angular displacement sensor on the cross together, constituting the Polar Sensor. It can be obtained the six-degree-of-freedom data of the Flexibility Nozzle in the state of the omni-axial movable veritably in real time. The true angular measuring system can be used for measuring the space angular of the Flexibility Nozzle of the solid engine、the variable quantity of the pivot point and the performance characteristics of Thrust Vector Control, having expansive application prospect and far-reaching application value.