5~50 Krad γ-irradiation obviously inhibits the sprouting of pototo tubers, a dosage above 10 Krad can protect potato tubers from sprouting for more than 210 days at room temperature.,In 2.5 hours after radiating potato tubers the induced release of the ethylene can be detected. The released ethylene enhances with the increase of the dosage and in 7 hours of radiation reaches the maximum value,then reduces, and ceases in 48 hours. The experiment with the precursors of ethylene Met. ACC and the inhibitor AOA proves that the generation of ethylene in potato tubers is done by the Methionine-Path which is activated by γ-ray.,1000 ppm ethylene stimulates the respiration and inhibites the sprouting of potato tubers in the way similar to the γ-ray activation. A deduction is made that the ethylene induced by γ-ray is the primary reaction of the γ-ray inhibition on the sproution in potato tubers.