Batch equilibrium method and Freundlich model were used to study the adsorption and desorption behavior of Zn in black soil and fluvo-aquic soil. The effects of pH and organic matter on the adsorption and desorption of Zn in the tested soils were analyzed. The results showed that both black soil and fluvo-aquic soil had strong adsorption capacity for Zn. The adsorption and desorption isotherms fitted the Freundlich model. The adsorption-desorption constants (Kf) of black soil and fluvo-aquic soil were 1882.03 and 1546.66, respectively. The adsorption capacity of zinc increased with the rising of pH when pH is between 4.6 to 7.4. After the removal of soil organic matters, Kf decreased, the empirical constant (1/n) increased, and the adsorption process showed strong nonlinearity.