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Using the cloud picture data of FY2E satellite, 35 regional rainstorm processes occurred in Meishan of the Sichuan basin during the summers (JuneSeptember) of 2012 to 2018 are analyzed, and the characteristics of convective cloud merging in the rainstorm processes are explored and studied. The statistical results show that convective cloud merging occurs in 88% of rainstorms, and the convective cloud merging is an important factor in the process of severe convective weather. According to the number and time of cloud merging, the processes can be divided into three categories: two monomer convective clouds merged, multiple convective clouds merging simultaneously, and multiple convective clouds merging repeatedly. At the same time, the merging phenomenon in rainstorms is closely related to the distance, area ratio, minimum bright temperature difference, and the average of the minimum bright temperature between the clouds.