Zhang Juzheng's Kaocheng Law and the One-whip Law were both economic reform measures during the Ming Dynasty. The Kaocheng Law was an important financial system reform implemented by Zhang Juzheng. It stipulated that a certain amount of taxes should be collected every quarter, and then the collected money should be distributed and used fairly to reduce the burden on farmers and increase the government's income. The characteristic of the Kaocheng Law was that it divided taxes into land taxes, corvee, miscellaneous taxes, and so on. It also stipulated their collection standards and collection time so that the government could more accurately grasp the financial situation. The One-whip Law was further improved on the basis of the Kaocheng Law. It changed the traditional way of collecting taxes into the form of the "One-whip Law", which was to collect all the tax revenue in a unified manner, calculate the amount of money to be collected by measuring the land and population, and then collect it at one time. This method of collection was more efficient and accurate, and it also reduced the burden on the government. Zhang Juzheng's Kaocheng Law and One Whip Law both aimed to improve the government's financial situation, reduce the burden on farmers, and improve the government's ruling efficiency. They made important contributions to China's economic and political reforms.