Disposible provides the device of radio-frequency ablation procedure, and one kind includes the improvement assembly of two ultrasonic imaging probes and a detachable needle. Sheath includes the ultrasonic imaging probe of the closely identical axis of remote area, but curtain is looser, in the ultrasonic imaging probe of handle. Disposable mirror sheath allows the ultrasonic imaging probe inserting needle component of both attachment features, will be easy to observe and be readily connected together.