When the new police was produced in 1902, there is no such position as the security guard. In Min Guo period, the security guards were built to protect the social order because of the turmoil and deterioration of the society. The security guards played an important role in maintaining the social security, dealing with the emergent group incidents, and resisting foreign aggression. In most time of the Min Guo Period, Tian Jin security guards mainly protected the interests of the local government, however, the police made certain contribution in maintaining the stability of the local society.