A three-dimensional (3-D) display system for medical objects by holographic technique has been developed. A shiftable cylindrical lens is introduced to refract the 3-D images projected from the spatial light modulator. The viewing region of the refracted image changes with the position of the cylindrical lens. Through an imaging lens, the refracted images with different viewing regions are imaged into the same target object and a 3-D medical display with an enlarged viewing angle is implemented based on time-multiplexing method. The displayed object can be viewed within 17 deg at the front of the display.