对斜槽式纵-扭复合振动模式压电超声换能器进行了理论及实验研究。推出了换能器的机电等效电路，探讨了槽的倾斜程度对复合超声换能器的共振频率的影响。实验表明，理论预测频率与实测频率基本一致。 The theoretical and experimental studies on chirped longitudinal-torsional vibration mode piezoelectric ultrasonic transducer are carried out. The electromechanical equivalent circuit of the transducer is introduced, and the influence of the inclination of the groove on the resonant frequency of the composite ultrasonic transducer is discussed. Experiments show that the theoretical prediction frequency and the measured frequency are basically the same.