The effects of respiratory intensity and enzyme activity of cytochrome oxidase,esterase andperoxidase at germtinating rice seeds by ion implantation were studied.The result showed thatwithin the limits of dosage,the respiratory intensity increased as dosage increased. So did theactivity of cytochrome oxidase. The cytochrome oxidase was very sensitive for ion implantation.The zymogram of esterase and peroxidase varied at 52 hours and 72 hours of germinated.