The word public security originated from the modernization process in Japan. Japanese is the abbreviation of public peace and Chinese is Public Security. Since modern times, China has introduced a large number of Japanese Chinese characters as teachers and directly supplemented them. For example, the introduction of Japanese Chinese police in the late Qing Dynasty corresponds to the modern police system, and the word police has a deep relationship with Beiyang. Since the beginning of the movement of protecting the law, the forces in southern Guangzhou, which were enemies of Beiyang, began to use the word public security frequently to refer to the police organs to show their progressive stance. With the deepening of the Northern Expedition, all the police organs controlled by the Northern Expedition were renamed as public security organs. After the remnants of Beiyang changed their flags, the National Government issued an order to rename the public security organs as police organs again. Since then, there has been no change in the Kuomintang-controlled areas. The liberated area in the border area of the Soviet Union continued the tradition of Guangzhou and was always called the public security organ.