Adopting γ- ray radiation as a kind of physical methods to modify starch has proven to be eco - friendly, high efficient, convenient and low costs. The research progress on the effect of γ- ray radiation to molecule structure, including starch molecular weight, the content of amylose and starch molecular groups, to identity of granule, including granule feature and its crystal structure, and to physic - chemical properties was summarized. The opinion of further studies on the subject was proposed whic...