The invention discloses an X-shaped grade separation induction system with a shadow effect and a method. According to the system, overpass structures of asymmetric heights above a road can be shieldedby a height limit frame, a driver can be prevented from trending to option a road of a relatively large net height, and traffic security can be ensured. Due to retroreflection marks on barriers and vertical columns on road sides, the system can be relatively clear and easy to watch, and the system also plays a role of vision induction at night under relatively poor lighting conditions. The vehicle speed control capability and the lane retention capability of the driver can be improved, and the traffic security can be ensured.