Antibiotics have been widely used as antimicrobial agents and additives in livestock products, causing a large amount of antibiotics entering into soil environment through the application of manures contaminated with these chemicals. As an important process of controlling the migration and transformation of antibiotics in soils, sorption behavior has great significance on the risk assessment and pollution controlling of antibiotics. The sorption of norfloxacin (NOR) and ofloxacin (OFL), two widely used fluoroquinolone antibiotics (FQNs) in agricultural purple soil in Chongqing were investigated with batch sorption experiments. The results showed that sorption processes of NOR and OFL in purple soil were very fast, and sorption equilibrium were achieved in 5 h with sorption coefficient K_d of 3 082 L/kg. Freundlich model was fitted well with sorption isotherms of NOR and OFL in purple soil. Gibbs free energy and sorption energy demonstrated that physical sorption was dominant in NOR and OFL sorption in purple soils. Solution pH greater than 6 may decreased NOR and OFL sorption in purple soil. When solution ion strength was up to 0.05 mol/L, sorption capacities of NOR and OFL were decreased by10.2% and 11.7%, respectively. Organic matter in soil had little effect on the sorption of NOR and OFL in purple soil.