Abstract: In this work,the effects of diatomite dosage,solution pH,adsorption time and temperature on the adsorption process were investigated through studying the adsorption of phosphorus by purification of diatomite in the simulated wastewater.The results showed that the optimal dosage of diatomite was 3.5g per 0.1mg phosphorus and the adsorption time was about 20min.The optimal solution pH was around 3.0 and the adsorption rate decreased with the increase of pH value,especially in alkaline solution.The best adsorption temperature was about 25℃.Diatomite on phosphorus removal in wastewater adsorption process is in line with the Freundlich isothermal adsorption equation.