During the Northern Song Dynasty, the country's financial revenue mainly came from the three departments, namely the institutions in charge of salt and iron, degree support, and household. However, in order to recover the sixteen states of Yanyun ceded by the Liao Dynasty, Emperor Taizu Zhao Kuangyin of the Song Dynasty separately established a financial institution named "Fengzhuang Warehouse", which was specifically used to store wealth collected from various regions. This wealth gradually increased as the Northern Song Dynasty gradually eliminated the separatist forces in the south. During the reign of Emperor Taizong Zhao Guangyi, part of the national treasury and the "Fengzhuang Warehouse" were unified and renamed as the "Neicang Warehouse", forming a huge wealth estimated to be tens of millions of coins.

However, this wealth was not entirely used for the recovery of the sixteen states of Yanyun. Instead, it was exhausted during the reign of Emperor Renzong Zhao Zhen. The main reason for this situation was that during Emperor Taizong's reign, he removed the name "Fengzhuang Warehouse" and allowed the sealed wealth to be used at any time, promising that the money would be used for the benefit of the people. Additionally, Emperor Zhenzong felt ashamed after signing the "Chanyuan Alliance" and spent a lot of money on building temples and performing rituals to show his achievements. For example, the cost of transporting the artifacts used in the rituals to Mount Tai reached ten million silver coins. These expenses gradually depleted the wealth of the Neicang Warehouse.

By the time Emperor Renzong Zhao Zhen took power, the wealth of the Neicang Warehouse had been almost entirely depleted. Even this emperor, known for his tolerance towards officials and the people, was unable to preserve the remaining royal wealth, and had to repeatedly subsidize from the "Neicang Warehouse". In conclusion, due to the chaotic financial management and extravagant spending of the emperors during the Northern Song Dynasty, this once-huge wealth was eventually depleted.

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