Abstract: Based on the Global Precipitation Measurement (GPM) rainfall data, the infrared cloud top temperatures (TBB) of FY-2E satellites, the organisation process of the convective rainfall event over Naqu on July 5th, 2014 was simulated by WRF model, and the key physical mechanisms affecting the convective organization process were analyzed. The results show that: (1) In the convection triggering stage, the high equivalent potential temperature and high convective available potential energy (CAPE) were induced by the influence of uneven heating in the afternoon around Naqu, which triggered the initial convections on the northwest and north sides of Naqu. (2) During the developing and mature stages, the convection system on the northwest side of Naqu moved eastwards and merged with the convection systems on the north side of Naqu. Meanwhile, the strong vertical wind shear (VWS) over Naqu further enhanced the strength and organisation of the convection. In turn, the enhanced convection enlarged the VWS, which further maintained and strengthened the convection. (3) At the end of the convective mature period, the cold pool outflow intensity formed by convective precipitation was unbalanced with the vertical wind shear intensity, which led to the weakening of organization and the dissipation of convection