Abstract: This hybrid transducer type linear ultrasonic motor is a new type linear ultrasonic motor which been proposed by authors. This paper describes its basic structure and operation principle, deals with the cause of the large thrust and large self--lock force when power is cut off which produced by this motor. The prototype motor's measured characteristics are shown, its maximum thrust is 11 N and maximum output power is 1.4 W, both backward and forward motion performance is roughly coincident.