In order to meet the requirements of the launch vehicle measurement system to visually shoot the separation of the rocket segments, this paper presents a simulation method for the effectiveness of the view field of the camera device on launch vehicle. Based on the launch mission of a certain type of launch vehicle, this study counts the period of time when the sun appears in the view field of the camera during the entire rocket flight for different launch windows, and analyzes the effectiveness of the view field of camera for the shooting task. Utilization of this simulation analysis method can provide a basis for the launch window decision, and guarantee the effectiveness of the view field of the camera device to the greatest extent without affecting the launch mission. This method has strong engineering application value.