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By using Doppler weather radar radial velocity and the echo intensity, a heavy snowfall happened on 2 to 5 March 2007 in Hebei Province is analyzed. The results indicate that the characteristics are obvious at the different stages of rainfall development (formation, development, and dissipation). The lowerlevel convergence, warm advection, and “bull’s eyes”shaped structure on the velocity chart indicate severe snowfall, and the gradual disappearing of warm advection from low to high indicates the weakening of precipitation. If there is an echo center of over 30 dBz lasted for certain time, severe snowfall will happen possibly. Precipitation enhancement should be conducted at the enhancing stage of snowfall. The elevation of the rocket may refer to the height of the zerodegree layer.