The length of time that China's grain reserves are enough for the whole people to eat fluctuates, depending on the types of grain, storage conditions, consumption speed and other factors. China State Grain and Material Reserve Bureau disclosed that the current national policy grain inventory accounts are basically the same, and the grain inventory quantity can meet the normal consumption demand of the national residents for more than one year. This is consistent with the information mentioned by the Minister of Agriculture and Rural Affairs when answering a reporter's question during the two sessions, that is, China's grain stocks are sufficient to feed the whole people for one year. However, if the renewal and replacement of grain reserves are considered, the old grain can not be used for human consumption, but can only be used for other purposes such as brewing and feed manufacturing, so it is necessary to constantly replace the new grain. In this case, according to the reserve, it will take at least one year and at most three years for the whole population to eat. In addition, according to the storage life of the central reserve grain and oil, different kinds of grain have different storage life. For example, the shelf life of Jiangnan rice is 2-3 years, and that of wheat is 3-4 years. The shelf life of rice in the north of the Yangtze River is 2-3 years, and that of wheat is 3-5 years. This means that during the storage period, it is necessary to constantly update and replace the grain reserves to maintain their quality and edible value. To sum up, whether China's grain reserves can last for one to three years depends on many factors. However, it is worth noting that China has a new grain harvest every year, and it will also import some grain. Therefore, in fact, China's food supply is safe and can meet people's needs.