There exsits generally the phenomenon about ultraweak photon emission from biological system in natural world.It was known that superweak luminescence exists in all animals and plants.The luminescence shows the important information of metabolism and energy transformation of the living biological organism.This passage did some research of rapeseeds?ultraweak luminescence based on nondestrucive testing. The experiment showed that luminescence intensity increased with the augment of mass, but the increase of luminescence intensity was not obvious when mass was augmented to a certain degree. It was nonlinear domino effect.