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由近地面层辐合线（切变线）引发的局地暴雨是北京夏季一种较为常见的天气类型。利用常规气象资料、数值预报产品难以分析预报出引发局地暴雨的中小尺度系统、进而不能正确把握降雨出现的时间、落区和量值的大小。本文利用北京S波段多普勒天气雷达（CINRAD-SA）监测资料、风廓线仪、微波辐射计等新型探测资料,以及北京加密自动站观测资料,并结合常规地面、高空探测资料,对2009年7月13日北京一次典型局地暴雨天气过程分析强降雨发生前期的天气形势背景、温湿条件、环境大气对流稳定性、风垂直分布等演变特征,分析诊断出造成局地暴雨的诱发系统主要是近地层切变线,研究了该系统与雷达降水回波形成、发展并造成强降雨过程的关系,探讨了近地面层辐合线与降雨强度及落区的关系,对探测资料如何运用于预报业务做了有益的尝试。“,”The local heavy rainfall initiated by surface convergence line（wind shear line） is very common in summer in Beijing area.It is very difficult to forecast the time,zone and intensity of the rainfall from routine observation data and numerical weather prediction products. In this study,with the aid of S-band Doppler radar（CINRAD-SA）,wind profilers,microwave radiometers,automatic weather stations,routine surface and rawinsonde observation data,a typical local heavy rainfall event was analyzed on fine-scale.The synoptic weather pattern,temperature and humidity fields,convective stability of ambient atmosphere,and the vertical distribution of wind were investigated.The surface wind shear line which caused the local heavy rainfall was diagnosed and the formation and development relate to narrowband echoes were proved by radar observed.The relationship between surface convergence line and the intensity and area of heavy rainfall was discussed.The work is conducive to the operational application of various new observation fine-scale data.