Laboratory experiment with different kinds of treatments on texted brown soil,namely original soil+calcium silicate(CaSiO₃),original soil+1mmol/L citric acid+CaSiO₃ and original soil+2mmol/L citric acid+CaSiO₃,was conducted to investigate the characteristics of soil phosphorus(P)adsorption and desorption in the presence of citric acid and silicon fertilizer by Langmuir,Freundlich and Temkin equation fittings.The OECD Guideline106batch equilibrium method was used for adsorption and desorption experiments.Results showed that the brown soil P adsorption fitted Langmuir and Temkin models better.The soil added calcium silicate and 1mmol/L citric acid treatment had the maximum adsorbed P,with the maximum adsorption capacity of 500mg/kg.The soil with calcium silicate and 2mmol/L citric acid treatment had the greatest desorption rate of P,with the maximum desorption rate of 45.2%.Therefore,the soil added calcium silicate and 1mmol/L citric acid treatment had the strongest storage capacity for P,and the soil added calcium silicate and 2mmol/L citric acid treatment had the strongest activation ability and supply capacity of P.