The oblate spheroid mirror is one of the two dimension rotation surface. It is an axially symmetrical aspheric surface, but not free from spheric aberration surface. It can’t be used individually in optical systems. The oblate spheroid mirror can make up with another mirror as a free from spheric aberration optic systems. So understand the oblate spheroid mirror is

essential. This paper introduced the oblate spheroid mirror and some testing method, furthermore, it also introduced how to design and choose from those method with author’s experience when we face different oblate spheroid surface.