TWR01 Weather Radar， a computerized smallscale digital radar, has the function of GIS and GPS, and it is suitable for the mobile or fixed antihail operation command and meteorological safeguard and service. The technique of the extraction of echo characteristic parameters of TWR01 Weather Radar is based on the way of the target outline extraction of images. The way plays an important role in image recognition and image analysis and is widely used in the field of measurement and remote sensing. The technique of the extraction of echo characteristic parameters of TWR01 Weather Radar is to extract and describe the geometric structure of radar echo according to its layer and intensity, thus possessing general text data connection, achieving then synchronous conservation of images and data and solving the technical problems of echo data and data analysis finished through manpower. The extraction and application of echo characteristic parameters of TWR01 Weather Radar can help quantitatively analyze the evolution trend of echo and the law of echo change, monitor the change of local weather, conduct antihail and warning operation, and assess the result of the operation. Based on this, the command system of antihail local operation warning of TWR01 Weather Radar is set up.