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On the basis of the analysis of Doppler radar data, combined with conventional weather data，satellite data, AWOS data, and automatic meteorological station data, the gust front event occurred in the Urumqi International Airport is analyzed. The results show that: (1) Meteorological elements changed obviously during the gust front, such as pressure rising, temperature dropping, and wind speed increasing, and the real time AWOS data show that wind direction and speed at both ends of the runway appeared discontinuous at the same time, and a strong horizontal wind shear occurred on the runway. (2) There was unstable energy accumulated because the moist air was capped by a dry and warm “lid”, and the atmosphere became potentially unstable. The sandstorm occurred near the surface convergence and dry line. (3) The convective clouds destroyed the inversion layer over Urumqi, and released unstable energy during moving eastward to the airport, strong wind and sandstorm from Hutubi to Urumqi occurred where TBB isoline converged with high gradient. (4) The gust front occurred on a narrow band of weak reflectivity and convergence area.