The work of estate service providers is kind of service for the resident occupants. But they have certain management authority at the same time. The above seemingly contradictory phenomenon requires a proper explanation for the clarification of the basic structure of China's estate system. Based on the membership right in the condominium ownership, the owner can manage the property and the person, which is the estate management of the owner. The owner entrusts the preservation and maintenance of the common parts in the property management to the property service provider through the contract, which is provided by the estate service provider based on the contract. Because of the natural inconvenience of the owners in human management, the owners can also entrust the management content of the people to the estate service providers, thus forming the management authority of the estate service providers. In order to avoid the absence of necessary delegation, there are two types of delegation: statutory and contractual.