When a spaceborne visible camera is imaging the objects on the ground, the radiation both inside and outside its field of view may bring stray light to the image plane of it. The stray light may degrade the imaging quality of the camera and even affect the normal operation of the camera. To improve the imaging performance of the camera, the generation mechanism and suppression measures of the stray light in a visible light system are presented. An optical and mechanical model of the camera is established. The stray light in the system is analyzed. The design of the baffle system is improved. Finally, a stray light measurement setup is used to measure the veiling glare index of the camera lens. Thus, the modeling analysis result is verified.