Two ellipsoidal surface reflectors, one was made by grinding and the other by molding, were detected using coordinate measuring machine. Contrasting to their profile line, a deviation distribution curve with peaks and valley on the first reflector and a linear deviation distribution on the other one are acquired. TracePro was used to simulate luminance of their reflecting spot and a reflecting effect ratio of 92% comparing between the two reflectors is obtained. Optical imaging method was used to inspect the reflected light spot and the result shows that bright and dim rings appear alternately in the reflected spot of the grinding reflector, and the other one gets a cloud-like reflected light spot.