With the society moving from decentralization to a whole and the strengthening of centralization, the state gradually enhanced the involvement in rural community. At the same time, the management of people-land relationship tended to be refined. The original Xiang-Li system, which was suitable to decentralized community, was no longer needed by the state, and would be inevitably replaced by smaller rural organizations that were suitable to centralized community. In this context, the Du-Bao system emerged as the times required. During this process, the combination of the Bao-Jia system, territory division, and mapping technique played a key role in pushing forward the refinement management of people-land relationship. From the Xiang-Li system to the Du-Bao system, from rural officials to rural servants, when rural power was transferred to the government, more new rural authority systems that embodied the state will replaced the traditional rural authority system. There was a lack of obvious dominant class such as aristocratic families and gentry representatives in rural community in the Song Dynasty. Such a unique era provided an excellent opportunity for the state forces to go deep into and change rural community. For this reason, thestate authority upon rural areas in the Song Dynasty exceeded the Han and Tang dynasties, and even the subsequent Yuan, Ming, and Qing dynasties.