Abstract: Grain shape of agricultural product affects the quality of agricultural product greatly. In the meantime, grain shape is an important parameter for the agricultural product inspection and grading. In order to utilize the foreign and native research findings, improve its research and application and give reference to researchers in this field in China, the research development was summarized from the following aspects: grain shape and quality (yield, special variety, processing quality, seed vitality) of agricultural product; grain shape and devising and using of agricultural machinery; influencing factors of grain shape; measuring technique of grain shape.