Results showed that the innerbud of garlic was insensitive to the change of dose in the range of 0.08~0.4kGy when irradiation was supplied. The innerbud's growth of the irradiated garlic was limited severely by the date of treatment. Generate tissue of root was more sensitive to irradiation treatment than that of innerbud. After irradiated with dose of 0.25kGy the generate capacity of root tip lost quieckly. The respiration rate of the irradiated garlic increased firstly and decreased finally while that of the control increased steadily during all the process of the experiment. It was indicated that there was a considerable relationship between the inhibition of sprouting and the date of irradiation treatment.