Abstract: Taking Ca-type clinoptilolite as the experimental material, batch experiments were carried out to investigate the influence of reaction time, dosage of Ca-type clinoptilolite, pH, temperature andorganic compounds on simultaneous removal of nitrogen and phosphorus from wastewater. The experiments showed that under the conditions of clinoptilolite dosage 250 mg/L, pH 7.0-9.0, temperature 25 ℃ and adsorption duration 24 h,the removal efficiency of high-concentration ammonium nitrogen by clinoptilolite could reach 96%, and the removal efficiency of phosphate could be close to 100%. The effect of pH on phosphate removal efficiency was significant, while the pH influence on ammonium nitrogen removal efficiency was very low. If the pH increases from 3.0 to 5.0, the removal efficiency of phosphate decreases from 54% to 43%, when adsorptive action is found to be the dominant phosphate removal mechanism. If the pH increases from 5.0 to 8.0, the removal efficiency of phosphate will rise dramatically, as chemical precipitation gradually becomes the dominant phosphate removal mechanism. Above pH 8.0, the removal efficiency of phosphate will be nearly 100%. The effect of organic matter on phosphate removal efficiency of clinoptilolite varied from one to another. Citric acid apparently restrained phosphate removal, reducing the removal efficiency by 16%, while humic acid had lessinfluence, reducing phosphate removal efficiency by only 3%. For ammonium nitrogen removal, the effect of both citric acid and humic acid was quite small, being less than 3%.