Grain crushing and automatic grading were common and inevitable phenomenon in grain transportation and storage. Grain crushing and automatic grading not only affect the use value of grain and reduce the processing quality and trade grade, but also bring great risks to the safety storage of grain. It’s of great significance to solve the problems of grain crushing and automatic grading for ensuring grain quantity, improving grain quality and storage stability, and ensuring grain safety. In this article, the causes of grain crushing and automatic classification during the process of storage were analyzed, and prevention measures were proposed according to the characteristics of grain. At the same time, to provide reference and guidance for storage enterprises when design or select devices, we also analyzed the characteristics and application of anti-breaking and automatic grading devices applied in current silo.