Abstract: On 1 July 2013, a regional heavy rain and local extremely heavy rain event occurred in northern China, in which local extreme rainfall was observed at Sizhilan town, Ningjin County, Xingtai city, Hebei province, with total rainfall 409 mm during this event. The hourly rainfall is over 100 mm for successive two hours form 17:00 BT to 19:00 BT 1 July 2013. Based on routine upper-level and surface observations,NCEP reanalysis data and Doppler weather radar data, we investigate the cause of the extreme flash-rain event in Ningjin. The main results are as follows. (1) Upper trough, surface cold front, and subtropical high together with the vortex shear line in periphery of it are the main influencing systems that induced this event. Additionally, the typhoon near Hainan influenced the rainfall remotely resulting in increased water vapor transfer from south to north. The quasi-stationary convergence shear line at the ground plays an important role in triggering new convections as well as maintaining and strengthening older ones. (2) During the most significant precipitating period in Ningjin, the strong vertical wind shear over it favors the production and development of well-organized convective systems. (3) The backward propagation of convective systems makes the radar echoes passing through the Ningjin County very slowly, and then strong echoes and large rainfall intensity lead to excessive rainfall in Sizhilan town. In addition, the relatively long time effects of a supercell with weak mesocyclone over the ain area have a clear contribution to the excessive rainfall in Sizhilan. 4) The convective system triggering extreme rainfall belongs to the strong convection type with high centroid rather than low centroid system, which often tends to originate severe precipitation. Meanwhile, we further discussed and validated some findings obtained by many scholars who have studied the“7.21”rainstorm event in Beijing.