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The longterm variation of starting wind speeds of wind speed sensors is analyzed in such detection environment as sea wind, dust, and acid rain to provide the qualitative bases for the correction of meteorological data under low wind speed weather. By experiments, using the starting wind speed calibration instruments, a group of starting wind speed records about new wind speed sensor and the special working environment of wind speed sensors are obtained.The results indicate that the longterm working for in the environment of sea wind, dust, and acid rain will reduce the sensitivity of the starting wind speeds of wind speed sensors.