Space optical systems always work in very bad conditions. The sunlight, airlight and various radiation, coming from the space constitute serious background noise of image plane in space optical system. This noise can reduce imaging quality, and even leads to detectivity losing of satellite remote sensor because of unable imaging. Because it can improve the bad influence coming from background noise and prevent directly stray-light out of the field of view, the vane has the ability to raise the ability of suppressing stray light. However, diffraction effect will occur when rays arrive the edge of vanes due to the small size of vanes. So, how to design reasonable vane is very important in baffle designing. A new type of vane which is produced by using focus-assemble innovation method is proposed in this article. Having compared with existing vanes and simulated, this new type of vane is proved to be predominant in stray light suppressing.