A single phase driven shortlength rodshaped linear ultrasonic motor is proposed and the moving principle and design process of the motor is discussed. The motor operates by the coupling mode with the longitudinal vibration and the lateral vibration. In order to have the same bidirectional movement characteristics for one driving frequency, the motor is designed with a symmetrical structure. The difference of elastic constant is used when piezoelectric ceramics are opened or shortened to realize the effective excitation of the longitudinal and flexural coupling mode driven by single phase driving signals. In order to increase the motor’s bending vibration mode amplitude ratio, the lumped mass simplified model of three degrees of freedom are used to optimize the structure of the motor. The prototype of the motor is produced and carried out the output performance test. Experimental results show that the motor has good output performance. The length of the motor is 22 mm and its weight is 3.3 g. The maximum output speed of the motor is 140 mm/s under the thrust of 0.3 N. The motor′s maximum output thrust is nearly 1 N under the preload of 5 N.