The status and problems of the data acquisition and supervisory system for medium-low voltage distribution network are presented. By referring to the actual needs of promoting medium-low voltage distribution network operation， a structure design scheme for centralized data acquisition and supervisory system for medium-low voltage distribution networks is put forward. According to the predetermined design philosophy， 5 functions are to be implemented， that is， intelligent data acquisition， communication and transmission， real-time data processing， power usage information management and monitoring， intelligent distribution area management and monitoring. A safety system design and interfacing with other existing systems are provided.