Information integration is the technical basis of compatibility， self-healing， interaction and optimization for the smart distribution grid. In light of the demand for information integration within the smart distribution grid and with the transmission grid， users and sources to achieve automation and interaction， the description of information flows among subsystems in power enterprises and the method of mapping between information models are proposed. The concept and technical line of establishing a set of unified information model system adaptable to the development of smart distribution grid is proposed based on an analysis of the status quo and new trends of power system information standards for their corresponding models in use and to be developed.