Abstract: Natural clinoptilolite zeolites from Weichang region, Chengde city, Hebei province were transformed to a zeolite Na-P using hydrothermal method. The as-prepared materials were characterized and analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, gas adsorption instrument, scanning electron microscope and energy spectrum analyzer. The heavy metal ions removal performance was evaluated by Cd²⁺ ion. The effects of alkali treatment concentration, hydrothermal temperature and time on the structure of natural zeolite were investigated. The composition, structural characteristics and heavy metal ion removal performance of the prepared zeolite Na-P materials were further studied. The results showed that clinoptilolite could be transform to zeolite Na-P with 3 mol/L NaOH solution under the conditions of hydrothermal temperature of 100 ℃ and hydrothermal time of 12 h. The adsorption capacity of the obtained material for Cd²⁺ was 35.7 mg/g, which was 7 times higher than that of natural zeolite. Its excellent performance was mainly due to low silicon/aluminum ratio and relative higher exchangeable Na ion content.