The Sui Dynasty was a short-lived dynasty, dying in two generations. But why do later generations always like to talk about the Sui Dynasty when talking about the Tang Dynasty? The Sui and Tang Dynasties are not separated? It is because the Sui Dynasty laid a good foundation for the prosperity of the Tang Dynasty. The most direct one is the Sui Dynasty's thousand-year granary. Emperor Taizong of the Tang Dynasty criticized Emperor Wen of the Sui Dynasty and Emperor Yang of the Sui Dynasty at the same time. He said that the Sui Dynasty had enough food to last for 50 years. This was not to praise Emperor Wen of the Sui Dynasty for leaving a lot of food, but to accuse Emperor Wen of the Sui Dynasty of "not pitying the people but cherishing the warehouses." Emperor Yang of the Sui Dynasty " Relying on this wealth, it is unethical to be luxurious."

It talks about opening warehouses to release grain dozens of times. According to statistics from Cen Zhongmian's "History of the Sui and Tang Dynasties", the number of uprising teams in the late Sui Dynasty reached more than 100. This was a very large number and required a lot of food.

The granaries were only full during the period of Emperor Wen of the Sui Dynasty. By the end of the Sui Dynasty, the situation took a turn for the worse. After Emperor Yang of the Sui Dynasty's three expeditions to Goguryeo, large-scale construction projects, severe famines in Guanzhong, Hedong and other places, and the looting and opening of warehouses by rebels from various places. Disaster relief (the purpose was to recruit troops) and other consumption, and the Guanzhong area suffered from widespread famine due to successive years of drought. In order to eat, Yang Jian had to lead his ministers and people to go out to beg for food collectively and went to Luoyang to eat food. He became the first "food-seeking emperor" in history. ".

After the recuperation of Emperor Wen of the Sui Dynasty, social productivity has been greatly developed, laying a very solid foundation for the Sui Dynasty. Even after the warlord melee at the end of the Sui Dynasty, there was still a surplus. The Tang Dynasty inherited part of the Sui Dynasty's heritage. Did you see that, Li Mi sent Li Shiji to open Liyangcang and let the people eat as they pleased, and they got more than 200,000 soldiers at once. More than 200,000 people ate whatever they wanted, but they didn't just eat a little bit.

There was a severe drought in the 14th year of Emperor Kaihuang's reign, and many people were hungry. At that time, the warehouses were overflowing, and no relief was allowed, but the people were ordered to chase the grain. However, this Daxing is not the Daxing District of Beijing, but the ancient capital of all dynasties - Chang'an, also known as Xijing. The Xijing Hospital in Xi'an is named after it. Although Emperor Wen of the Sui Dynasty built a capital city, Wen of the Sui Dynasty did not pity the people but cherished the warehouses. By the end of the year, he calculated that the world's reserves would last for fifty or sixty years. Emperor Yang relied on this wealth, so he was extravagant and immoral, which led to his destruction.