关键词: 经济循环；马克思主义流通理论；市场分割；全国统一大市场

Abstract: The only way to give full play to the advantages of Chinas ultralarge market is to speed up the construction of a unified national market and promote the formation of a domestic largescale cycle with complementary supply and demand， common progress in production and sales， and smooth and efficient operation. According to Marxist circulation theory， commodity circulation and market development are mutually reinforcing， while the unified big market is the product of the markets advanced stage. How to fully understand and grasp the content and characteristics of the unified big market needs to start from the Marxist circulation theory and clarify the related individual relations， in order to promote the construction of a unified big market across the country. The construction of a national unified large market is facing problems such as lagging market system and facilities construction， market segmentation of commodity elements， and blurred boundary between government and market functions， which need to be solved by changing government functions， adjusting industrial policies， coordinating urban and rural regional development and strengthening infrastructure construction.

Key words: economic cycle; Marxist circulation theory; market segmentation; unified national market