To meet the needs of meteorological operation,especially for weather modification,a radar echo positioning system is developed,which can locate radar echoes by means of the radar images from the Internet,including the azimuth angle,height above sea level and distance relative to radar station,and locating elevation,azimuth angle and distance that the echo relative to operation station.The system can provide more exact information for weather modification operation to reduce blindness and increase efficiency in operation.The system adopts Visual C~(++) in programming and has a user-friendly,visualized and convenient interface and good practicability.