The curved road is complicated and special, becoming the high incidence area of traffic accidents. In this paper, a curved road radar early-warning system is designed and implemented. The system is using a 24 GHz traffic radar to detect vehicles in the curved road, analyzing the radar data by the microprocessor STC12C5A60S2, and displaying the results by the Light-Emitting Diode (LED) display screen. The system can provide real-time warning for vehicles, enhance the security of the crossing in the curved road, and reduce traffic accidents effectively.