To rapidly detect whether the rice has been treated with irradiation to eliminate quarantine pests, the changes of starch viscosity profile of glutinous rice after irradiation were studied. The results show that the starch viscosity decreases dramatically with increasing the absorbed dose and under the regulation of detection auxiliary. The absorbed doses could be estimated with the relation between the peak viscosity, the hot paste viscosity, the cool paste viscosity and irradiation dose respectively. With the regulation of detection auxiliary we could rapidly detect whether the rice has been treated with irradiation.