Abstract: Organic fertilizer is rich in organic matter and nutrients, which can improve the soil quality and also modify the environmental behavior of pesticides in the soil. To clarify the effect and mechanism of cattle manure on atrazine (ATZ) sorption in sierozem, the batch equilibrium methods were used to analyze the sorption dynamics, sorption thermodynamics, pH, ion types and strengths, and other influencing factors. The results showed that the sorption process of ATZ and sierozem applied cattle manures can be divided into fast sorption and slow sorption until equilibrium. The pseudo-second-order kinetic model can better describe the sorption process. The application of cattle manure fertilizer increases the sorption equilibrium time of pollutants in sierozem, and the sorption rate is combined by intraparticle diffusion and external liquid membrane diffusion. After the application of cattle manure fertilizer, the sorption thermodynamics of ATZ fitted well with the Freundlich model, with 1/n between 0.42 and 0.64, which belongs to the "L-type" isothermal sorption mode. Both low and high temperature will inhibit the sorption of ATZ on sierozem. The pH and coexisting ions are key factors affecting the sorption of ATZ on sierozem. With increasing pH values, the sorption capacities of ATZ on sierozem were decreased, which may be associated with ionization of ATZ, and in the alkaline case, ATZ is present as an anion, producing an electrostatic repulsion with the negatively charged sierozem. Different ions and ion strengths will be affecting the ATZ sorption on sierozem with a strong buffer effect, however, after application of organic manure fertilizer into sierozem, the increase the ions in soil solution may lead to the existence of competitive sorption between organic ions and cation on sorption sites in sierozem surface, thus inhibit the sorption of organic ions on sierozem. The sorption of ATZ on sierozem is mainly the result of ion exchange, electrostatic action, hydrogen bonding, van der Waals force and surface complexation. The results showed that the application of natural organic fertilizer such as cattle manure may lead to altered ATZ sorption behavior and mechanism, and the migration risk of ATZ in sierozem is reduced. Our results will be improved understand the risk of the application of natural organic fertilizer in barren loess soil, and provide theoretical basis and reference for the control of the triazine pesticides in the study areas.