Abstract: The super-micronized starch was prepared by High-speed Jet Mill associated with Ball Mill. The result shows that the efficient diameter of the super-micronized starch is 3.126μm and its crystallinity is reduced from 38.7 % to 17.1%. After plasticised by glycerol, its crystallinity becomes 9.3%. In this way, the mechanical property of starch is improved and it can be applied to food package film. The content of starch in the film reaches 55%, and the water resistance and oil durance of the film are excellent. Its biodegradable rate is 67% in the soil after 120 days.

Key words: Super-micronized Starch , Biodegradable , Package Film