The long-term effects of Zn(Ⅱ) on the properties and pollutant removal efficiencies of aerobic granular sludge in sequencing batch reactors (SBR) were investigated systematically. The results show that Zn(Ⅱ) with a concentration less than or equal to 5 mg/ L has a slight effect on the properties and pollutant removal efficiencies of aerobic granular sludge. When the concentration of Zn(Ⅱ) is greater than or equal to 10 mg/ L, the pollutant removal efficiencies of the sludge are reduced, leading to variations of the mass concentration of mixed liquid suspended solids (MLSS) and the sedimentation rate, granular size, and structure of the sludge. Along with the long-term effects of Zn(Ⅱ), the average diameter of granules decreased, the sludge structure loosened, and the sedimentation ability deteriorated, which, finally, resulted in the decrease of the MLSS concentration. After 10 and 15 mg/ L Zn ( Ⅱ) were separately dosed for 76 days, the removal rates decreased to 84.3% and 75.1%, respectively, for NH+4 -N, and 90.1% and 85.7%, respectively, for COD; the MLSS concentration dropped to 3658 and 3225 mg/ L, respectively; the sludge volume index (SVI) increased to 94 and 99 mL/ g, respectively; the average particle size decreased to 0.58 and 0.37 mm, respectively; and parts of the granular sludge disintegrated.