The present invention provides a method for reducing the content of heavy metals in blood and improving the pulmonary function using green pear fruitlet extract. The green pear fruitlet extract can effectively reduce the content of harmful heavy metals in human body to prevent the harmful effects of heavy metals, and improve forced vital capacity and the peak expiratory flow of humans to reduce the respiratory resistance and increase the expiratory flow. The green pear fruitlet extract is prepared by extracting green pear fruitlet using water, alcohol, or a mixture of water and alcohol as a solvent.