As the ancients said, food is the most important thing for people. Since ancient times, food has been a necessity for people, and food is a necessary substance for people to survive. Without food, people can't survive, and food is very important for the development of a country and a nation. Especially during the war, food is the primary consideration, and there has always been a saying in the military that "food and grass come first, and the military forces have not moved." This shows the importance of food to the war and the people.

In ancient times, due to the relative backwardness of production tools, agricultural farming, irrigation and harvesting techniques were far worse than now, and the grain yield was low, only one or two hundred kilograms per mu, or even less. When encountering natural disasters such as drought, flood or insect pests, or even crop failure, the state and farmers attach great importance to the storage and preservation of grain, especially farmers in mountainous areas. In order not to starve themselves, when the weather is favorable and the grain is abundant, in addition to paying taxes, they must also keep the grain for three years to prevent natural disasters (such as war). The state has not built a large number of granaries, and has reserved more grain for emergencies.

For example, in the late Yuan Dynasty and the early Ming Dynasty, heroes competed side by side in the land of China. In order to completely defeat the Yuan army and overthrow the rule of the Yuan Dynasty, the peasant uprising army headed by Zhu Yuanzhang adopted the advice of Zhu Sheng, a counselor and strategist: "Build a wall high, accumulate grain widely, and slow down to be king." Constantly expanding its military strength, it finally overthrew the rule of the Yuan Dynasty and established the Ming Dynasty.

After the founding of New China, in 1960s and 1970s, according to the domestic and international situation at that time, President Mao Zedong put forward the idea of "digging deep holes, accumulating grain extensively and not seeking hegemony". Prepare for war, prepare for famine and serve the people. " Digging is to dig a bomb shelter to prevent air strikes and nuclear bombs by imperialism and the former Soviet Union. Saving for a rainy day is to find ways to store more food and prepare for the enemy's attack. If we don't seek hegemony, we will never give in to the enemy. Preparing for the famine and serving the people all show the wisdom and high strategic vision of our great leader Chairman Mao.