The size distribution laws of particles in rainwater runoff were analyzed through field measurement of rainwater runoff quality. The impacts of rainwater runoff particles on the clogging of ceramic permeable brick were systematically investigated employing laboratory tests where the process of the clogging of permeable brick resulted from rainwater runoff was simulated. The results show that the average sizes of most particles in the rainwater runoff are less than 50 μm. The surface clogging caused by particles with sizes of 20~<50 μm is the main clogging mechanism of ceramic permeable bricks, and the mass of particles intercepted on the surface contributes 75% to the total mass of particles intercepted in the bricks. The size range of intercepted particles on the brick surface isnt consistent with the pore size range of the superficial brick, which is mainly caused by the filtration interception of formed filter membrane on the permeable brick surface by intercepted particles. The proportion of pore size under 50 μm of a permeable brick is suggested to be reasonably reduced to improve the permeability recovery of a permeable brick by manual cleaning.