In order to identify the working modes of the stator of ultrasonic motor using in-plane coupling longitudinal modes， and to provide a basis for their stator dynamic optimization， a modal recognition method for stator is proposed by means of local mode correlation analysis. Firstly， the working modes of stator are analyzed， and the difficulties of in-plane vibration mode identification are analyzed based on the principle of laser Doppler vibration measurement system. On the basis of the dynamic analysis of the stator， the method to identify the working mode by the local mode shape at the bottom of the vibrator is proposed； Finally， the feasibility of the method is verified by the frequency response results obtained by the laser Doppler vibrometer. This method can be extended to identify the working modes of similar ultrasonic oscillators composed by a pair of longitudinal mode vibrator， and also can be applied to extract the working modes more efficiently from multi-modal analysis results obtained from the finite element analysis， which lays a foundation for the dynamic optimization of the structure.