With the transformation of the global energy structure and the development of intelligent technology, smart microgrids, as an important part of the new electricity system, have attracted widespread attention for their development trends and key issues. First, the development history and connotation evolution of microgrids in various countries are discussed, then the development trend of smart microgrids in China is analyzed, including the main development scenarios, evolution trends, characteristic trends, etc. Finally, the key issues that needed to be paid attention to in smart microgrids are pointed out, and corresponding countermeasures and suggestions are proposed.