To meet the demands on suppressing strictly stray light for a coronagraph,a white coronagraph is designed based on its working principle and the properties of stray light. The white coronagraph shows its main specifications in the field of view of 2.5 R⊙ to 15 R⊙,a resolution of 14″,a aperture of 30 mm,a focal length of 200 mm,and the total length of 1080 mm.Furthermore,the length of optical structure is 370 mm and the MTF value at 37 pl/mm is above 0.5. The four kinds of stray light sources is analyzed in detail,which is direct sun light,the diffractive light of sun light at edge of an external occulter D1,the diffractive light of sun light at edge of a field stop A1,and the multi-reflection light in the objective O1.With the help of conjugated stops,a stray light suppressing structure is designed. Experiment results show that four main stray light sources are totally suppressed and the stray light suppressing level reaches 10-8-10-10 B⊙,which satisfies the system requirements.