A projection apparatus, comprising: an illumination system, comprising a light source, wherein the light source provides an illumination beam; a light valve, disposed on a transmission path of the illumination beam, the light valve comprising an image display surface, and configured to convert the illumination beam into an image beam; an optical actuation element, disposed on a transmission path of the image beam, and configured to deflect a transmission direction of the image beam within a frame period; and a projection lens, configured to receive the image beam coming from the optical actuation element, and projecting the image beam to a display medium to form an image frame on the display medium, the projection lens has an optical axis, wherein the image display surface of the light valve comprises a first region and a second region, the first region comprises a plurality of first pixels configured to convert the corresponding illumination beam into a plurality of first sub-image beams, the second region comprises a plurality of second pixels configured to convert the corresponding illumination beam into a plurality of second sub-image beams, the first sub-image beams and the second sub-image beams form a part of the image beam, a transmission path of one of the first sub-image beams in the optical actuation element is a first transmission path, a transmission path of one of the second sub-image beams in the optical actuation element is a second transmission path, and a length of the first transmission path is smaller than a length of the second transmission path, the optical actuation element comprises a light transmitting element, having a first end and a second end opposite to each other, wherein a width of the light transmitting element is gradually decreased along a direction from the first end to the second end, characterised in that the optical axis of the projection lens is outside the light transmitting element. an illumination system, comprising a light source, wherein the light source provides an illumination beam; a light valve, disposed on a transmission path of the illumination beam, the light valve comprising an image display surface, and configured to convert the illumination beam into an image beam; an optical actuation element, disposed on a transmission path of the image beam, and configured to deflect a transmission direction of the image beam within a frame period; and a projection lens, configured to receive the image beam coming from the optical actuation element, and projecting the image beam to a display medium to form an image frame on the display medium, the projection lens has an optical axis, wherein the image display surface of the light valve comprises a first region and a second region, the first region comprises a plurality of first pixels configured to convert the corresponding illumination beam into a plurality of first sub-image beams, the second region comprises a plurality of second pixels configured to convert the corresponding illumination beam into a plurality of second sub-image beams, the first sub-image beams and the second sub-image beams form a part of the image beam, a transmission path of one of the first sub-image beams in the optical actuation element is a first transmission path, a transmission path of one of the second sub-image beams in the optical actuation element is a second transmission path, and a length of the first transmission path is smaller than a length of the second transmission path, the optical actuation element comprises a light transmitting element, having a first end and a second end opposite to each other, wherein a width of the light transmitting element is gradually decreased along a direction from the first end to the second end, characterised in that the optical axis of the projection lens is outside the light transmitting element.