Abstract:Three downburst events in Shandong Province were analyzed with Doppler radar data from Jinan, Xuzhou and Linyi. A severe storm with maximum reflectivity between 60-70 dBz, and C-VIL between 41-76 kg·m-2, and cell-top above 10 km, developed in the northeast part of Shandong Province, and produced downburst beyond 4 km across, accompanied by severe hails and heavy precipitation on 27 June 2009 (0627 storm). A severe storm with maximum reflectivity between 56-64 dBz, and C VIL between 26-51 kg·m-2, and cell top above 8 km, developed in the north part of Shandong Province, and produced downburst beyond 4 km across and hails on 25 July 2006 (0725 storm). A storm with maximum reflectivity between 55-59 dBz, and C VIL between 30-48 kg·m-2, and cell top above 10 km, developed in the south part of Shandong Province, and produced downburst as small as 2 km across on 8 July 2009 (0708 storm). The results show that the signatures of upright airflow in three storms were similar, namely cyclonic rotation at mid level, this air flow structure was conducive to the development and maintenance of the severe storm. The downbursts have a pattern of pure diverging or a pattern of anti cyclone diverging Doppler velocities at the surface layer. The dropping markedly of reflectivity factor core or cell top can produce acceleration of downward tilt airflows at middle levels in the storms, this fact can be used to issue downburst warnings. High values of 0-2 km and 0-6 km vertical wind shear, and high CAPE values can produce severe　downbursts. The peak average radial velocity above 28 m·s-1 at low levels can lead to strong wind above 25 m·s-1 on the ground. 