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Due to the differences in locations, types, emissive power, elevation and boot-strap time, etc, of weather radars, a method for normalizing echo image data for weather radar is put forward. The normalization was carried on the power, time, and location of echo data from different weather radar. It provides a reliable data foundation for the concatenation of the regional weather radar echo images. It can use the echo technology over overlapped regions to form the networking radar echo images, thus adopting the sphere projection to get better weather radar echo images.