Experimental investigations on the micro-actuators driven by liquid crystals have been performed. The nematic liquid crystalline material, 5CB, is placed between parallel plates that the lower plate is fixed, but the upper one can freely move. Electric fields are imposed between the plates, and then the movement of the plate is observed using a microscope. When the electric field is imposed between the plates, the back-flow is induced between the plates as the orientation direction of the liquid crystalline molecules rotates toward the direction of the electric field. Then the upper plate slides due to the flow. The direction of the movement of the upper plate corresponds to the anchoring direction of the liquid crystalline molecules at the plates. On the other hand, when the electric field is turned off, the upper plate moves in the opposite direction to the direction when the electric field is imposed. The movement speed of the upper plate is also observed as well as the moved distance, from the microscope images. When 10V is imposed, the moved distance of the upper glass plate is about 45 micro-meters, and the maximum speed reaches 0.117 mm/s. However, when the electric field is turned off, the upper plate moves in the opposite direction and its distance is about 7.5 micrometers. Thus, it is observed that one cycle of the turn-on and turn-off of the electric field causes the 38 micro-meters movement to the upper glass plate. From this observation, it is easily expected that the total moved distance increases by imposing the pulsed voltage repeatedly. When three times of the pulsed voltage are imposed, the total moved distance reaches about 73 micro-meters. In this case, it is observed that the moved distance per pulse decreases as repeat count increase. The moved distance for the first pulse is about 38 micro-meters, but the distances for the second and the third pulses are about 19 and 16 micro-meters, respectively. The reason for the decreasing of the moved distance is that the director field after the pulse does not return to their equilibrium state.