A projection apparatus includes an illumination system configured to output an illumination beam, a light valve and a projection lens. The illumination system includes a laser light source configured to emit a laser beam and a wavelength conversion element. A first region of the wavelength conversion element includes at least one first and second optical function region. In a first sub-time interval, the first optical functional region guides the laser beam to a first position with a first optical path, wherein the light valve is located at the first position. In the second sub-time interval, the second optical functional region guides the laser beam to a second position with a second optical path, wherein the second position is different from the first position. The projection apparatus of the present invention has good image quality.