A zoom lens apparatus with focus adjusting, comprising: a first tube with threads formed on the inner surface thereof, a second tube with threads (231, 232) formed on both outer and inner surfaces thereof, wherein the second tube is placed inside the first tube, the pitch and/or the spiral direction of the threads on the outer surface is different from that of the threads on the inner surface, and the threads on the outer surface are arranged to match with the threads on the inner surface of first tube, a third tube placed inside the second tube, wherein threads are formed on the outer surface of the third tube for matching with the threads on the inner surface of the second tube, the hollow portion of the third tube is arranged to hold a first optical lens set, and the third tube is radially fixed relative to the first tube such that the third tube is moved in a straight line along the rotary axis of the second tube during the rotation of the second tube, at least one rod, characterized by a first set of piezoelectric elements attached on the outer surface of the first tube and excited by electric signals to propel the first tube to generate a traveling wave, so as to force the second tube to rotate relative to the first tube, and a voice coil motor comprising a stationary portion and a movable portion, wherein one of the stationary portion and the movable portion comprises a magnet and the other comprises a conductor, the conductor is excited by electric signals for driving the movable portion to move in a straight line relative to the stationary portion, the stationary portion is fixed relative to the first tube such that the motion path of the movable portion is parallel to the rotary axis of the second tube, and the movable portion is arranged to attach a second optical lens set thereon, wherein the rod is radially fixed relative to the first tube, and wherein the third tube radially fixed relative to the first tube comprises: at least one through hole formed within the wall of the third tube and parallel to the rotary axis of the second tube, therein the rod passes through the through hole such that the third tube is moved in a straight line along the rod during the rotation of the second tube. a first tube with threads formed on the inner surface thereof, a second tube with threads (231, 232) formed on both outer and inner surfaces thereof, wherein the second tube is placed inside the first tube, the pitch and/or the spiral direction of the threads on the outer surface is different from that of the threads on the inner surface, and the threads on the outer surface are arranged to match with the threads on the inner surface of first tube, a third tube placed inside the second tube, wherein threads are formed on the outer surface of the third tube for matching with the threads on the inner surface of the second tube, the hollow portion of the third tube is arranged to hold a first optical lens set, and the third tube is radially fixed relative to the first tube such that the third tube is moved in a straight line along the rotary axis of the second tube during the rotation of the second tube, at least one rod, characterized by a first set of piezoelectric elements attached on the outer surface of the first tube and excited by electric signals to propel the first tube to generate a traveling wave, so as to force the second tube to rotate relative to the first tube, and a voice coil motor comprising a stationary portion and a movable portion, wherein one of the stationary portion and the movable portion comprises a magnet and the other comprises a conductor, the conductor is excited by electric signals for driving the movable portion to move in a straight line relative to the stationary portion, the stationary portion is fixed relative to the first tube such that the motion path of the movable portion is parallel to the rotary axis of the second tube, and the movable portion is arranged to attach a second optical lens set thereon, wherein the rod is radially fixed relative to the first tube, and wherein the third tube radially fixed relative to the first tube comprises: at least one through hole formed within the wall of the third tube and parallel to the rotary axis of the second tube, therein the rod passes through the through hole such that the third tube is moved in a straight line along the rod during the rotation of the second tube.