“KuaFu Mission” is an “L1 + Polar” triple satellite project. KuaFu is composed of three spacecraft. A white light coronagraph (2.5 R⊙ to 15 R⊙ ) is a key instrument in the “KuaFu A”. It is the first time for us to fabricate the satellite-based coronagraph. The coronagraph requires the strict stray light suppressing. In this paper

based on the principle of the coronagraph

its optical character and the basic rules of suppressing the stay light are analyzed. The external occurred white light coronagraph is designed. In this system

the FOV is 4 degree

the resolution is 14 arc sec

the aperture is 30mm

the focal length is 200mm

the total length is 1080mm

the length of the optical structure is 370mm

and the MTF value at 37pl/mm is above 0.5. With the help of the conjugated stops

the four main stray light sources are totally suppressed

and a very high stray light suppressing level is obtained.