Small and medium-sized cities are an important support for China’s high-quality development，the main battlefield of new urbanization，and an important strategic fulcrum for Rural Revitalization and urban-rural integrated development. In the new era，facing the world’s unprecedented changes in a century，China’s economic and social development faces many opportunities and challenges. Small and medium-sized cities should grasp the changes of the times，promote factor flow and open cooperation，deeply integrate into the “double cycle” economic system，accelerate digital transformation and reconstruct the development strategy of the new era，Play a greater role and achieve higher quality development in the new journey of building a modern socialist country in an all-round way.