Abstract: Under the effect of simulating different pH rainfall,the law of activation and release of metal in permeable bricks by rainwater runoff in Chongqing was studied.The results show that the permeable brick has a certain acid buffering capacity for rainwater with pH>4.00.The amount of Pb,As,Cr,Cu,Mn and Ni dissolved in the permeable bricks is closely related to the pH of the rainwater.When the rainwater pH=3.00,the metal elements in the permeable bricks have the highest activity,and the risk of runoff pollution is the greatest.The dissolution of Cd is the smallest and has no direct relationship with the pH of rainwater.The risk of runoff pollution of various elements:Cr>Cu>Ni>Mn>Zn>As>Pb>Cd.Cd,Cr,Cu and Ni in the leachate exceeded the groundwater Class I water quality limit at each pH level.Cr and Cu exceeded the surface water Class I standard limits at each pH level.Among them,the dissolution rate of Cr in each pH grade far exceeds the limit requirements of surface water and groundwater,and the risk of water pollution of each element:Cr>Cu>Ni>Cd,the concentration of other elements is far below the standard limit,so The impact can be ignored.