By using the NCEP reanalysis data, the conventional observation data and Doppler radar data, a comprehensive analysis of circulation pattern of the typhoon "Meari" , which affected Weihai during 25 to 27 June 2011, and some other physical conditions including moisture and dynamic condition during the rainstorm were conducted. The results showed that this heavy precipitation and strong winds are caused by the strong tropical storm which moved to the Shandong Peninsula region directly. The water vapor of the heavy precipitation was from north and east of " Meari" and the low-level jet of the subtropical highs edge. The subtropical merging with Northeast high-pressure played an important role in blocking " Meari" moving east and guiding it north. This process is not accompanied by obvious invasion of cold air, the whole process of precipitation mainly stratiform precipitation did not produce strong convective activity. When the typhoon center is near, there is the phenomenon of wind speed weakened.%应用NCEP再分析资料、常规观测资料及多普勒雷达探测资料,对2011年6月25～27日台风“米雷”影响威海期间的环流形势、暴雨形成的水汽和动力热力条件及其他相关要素场进行了综合分析.结果表明,此次的强降水及大风是由强热带风暴北上直接影响山东半岛地区造成的；强降水的水汽主要来自“米雷”东部和北部以及副高边缘的低空急流；东北高压同副高合并加强,对阻挡“米雷”东移,引导其北上起重要作用；由于此次过程没有伴随明显的冷空气入侵,整个降水过程主要以层状云降水为主,并未产生较强的对流活动；“米雷”中心靠近时存在风速减弱的“台风眼效应”.
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