A projection apparatus includes an optical engine base, a light source, a light valve, a lens module, and a fan. The light source is disposed at the optical engine base for emitting an illumination beam. The light valve is disposed at the optical engine base for converting the illumination beam into an image beam. The lens module is disposed at the optical engine base and includes a lens barrel and a lens assembly disposed in the lens barrel for converting the image beam into a projection beam. The fan is disposed at the optical engine base, and adjacent to the lens module. The fan is used for providing an air flow to cool the lens module.