It is the trend to investigate and implement smart grid in the 21st century. Based on the intelligent primary and secondary equipments， smart grid is the future power grid which integrates electrical and communication technologies closely. The paper introduces the development and technical content of smart grid firstly. According to the requirement of protection and control system of smart grid， the paper indicates that synchronized measurement technology provides necessary technical basis for protection and control， and proposes the structural design of integrated protection and control system based on wide-area information. Lastly， the paper discusses the technical issues and research ideas for smart distribution grid.