The copper adsorbing properties of brown soil and effects of soil conditions on soil adsorption were studied in this paper. The results showed that copper adsorption of brown soil increased with copper equilibrium concentration, but the increase slowed down at high copper concentration. Its copper adsorbing capacity was much lower than that of cinnamon soil, which was in the same region. The adsorbing properties could be simulated with Langmiur, Frundlich, Temkin and Michaclis Menten models. Soil acidity could decrease soil adsorption of copper, and the Frundlich could simulate the isothermal curve better when modified with hydrogen concentration. Other soil conditions e.g. ionic strength and companion ions all had some influence on copper adsorbing properties of brown soil. With the increase of ionic strength and higher valence companion cations, copper adsorption decreased.