Quality indexes and the variations of the wheat in bunker during storage were tested to research the grain storage performance of the bunker, and investigate the suitability of the bunker storage in the grain and oil normal storage age limit regulated by the state. The research showed: there was no significant difference in the storage quality indexes' decline rate between the bunker with the capacity above 10 000 t and large warehouse, even the decline rate in some bunkers were lower than that in large warehouse; after storage for 3~5 years, both of the wheat's color and smell were normal, the tasting score was above 70 points, and the gluten water absorption was higher than 180%, which meant the wheat was suitable for longer storage. However, the grain quality declined faster in small bunker than that in large warehouse. A few indexes were tested to find that it was slightly unsuitable to store any longer and should be delivered as soon as possible.