Baffle design is an important part of geostationary earth orbit (GEO) imaging system design engineering. According to characteristic of space stray radiation environment, the influence of the varied sun shading angle to the baffle′s structure is analyzed, and height-diameter ratio is discussed. Then, the difference of stray light suppression between bladed and honeycombed structure is studied in different off-axis angles, and the Tracepro simulation results show that the bladed one has a better performance of suppression than honeycombed one with improvement from 5% to 28%. Moreover, referred to the works of blackbody, an improved two-stage baffle is obtained, and an example of baffle design of GEO imaging system is cited. It is indicated that the point source transmittance (PST) curve is less than 10-8 at sun shading angle, and the problem of diffraction effects in inner edge of single-stage structure is removed. The new structure is better in stray light suppression and satisfies the engineering application requirements.