The main topic of this thesis is linked up the Ch’ing dynasty official document system with the rules of the post house system. After Manchu entered into China, which built the Ch’ing Empire, the basis of the official document systems were succeed from the Ming dynasty. It seems like the same constructions and rules, however, with the expansion of the territory, the complication of the administrative affairs and the increasing of the confidential information, it must adjust the institutional structure with the current situation.Without destroying the old systems but also conforming the emperor needs, the government must design a new confidentiality and quickly official document style, Palace memorial, in other words, the simple and convenient Tsou-che. And then gradually phased out tsou-pen which included in the present chapter system, only reserved the t’i-pen. Because t’i-pen also be the final base of the administrative decision, the t’i-pen and Palace memorial become the main government administrative official document. The design of the Palace memorial, whether official or private business, can be transmitted by it, and it also can help the emperor to control the whole country’s provinces information. In addition, it also made the emperor could communicate with the ministers directly, decrease the T’ung-cheng shin-ssu transmitting delay and disclose the secret, and increase the administrative efficiency. Furthermore, connecting the Palace memorials are the stronger post house system, which manage by the department of the war, be the transfer message bridge between the central and local government. The post house system development can be tracked from the early of Ch’ing dynasty, it started from the Sheng-tsu emperor who made whole country post houses from private to nationalize.He made the foundation of the following years prosperity and control the whole post house system operational process, especially the fully efficiency post house system deliver function is the critical success factor. Then, the following three emperors, K’ang-his, Yung-Cheng and Ch’ien-lung, in order to reduced unauthorized to use the post house, so they ordered strict laws which divided different document using levels, urgent or unurgent delivery mileage speed and used “The Document registry” as audit tools. The innovation of the Palace memorial and the post house which make the inner court, orders from the emperor, being to change. The most obvious is the establishment of the Grand Council and new style Secret Edicts, these two styles increased the right of emperor powers deeply, in contrast to decrease the Cabinet authority. The golden age of the Ch’ing dynasty was established in two favorable conditions, the new document system and nationalized post house system. The progress of official document which decided by the simple and convenient deliver process, so the Palace memorial and Secret Edicts cannot continue until the end of Ch’ing dynasty while the system of the present chapter non-existent except in name. After the mid of the Ch’ing dynasty, the western countries forced China to open trading, with the Western’s telegraph, railroad and steamship keep introducing to China. The paper style of official document gradually replaced by the electric style, and the proud of the post house system was also lost the competitive speed ability with the steamship and railroad. Therefore, the division of each periods can be classified as the pre-foundation, mid-innovation, and post house-conversion, the operation of the document system and the post house system could understand a country’s prosperity and recession.