Collective economy has the basic characteristics of public ownership in economic system and community in population settlement，as well as the essential characteristics derived from it，such as internalizing social cost，saving transaction cost，localizing income，indirect socialization of property rights and so on. As the socialist mode of production，the collective economy is bound to adopt the specialized division of labor and cooperation based on joint labor so that farmers can share the value-added benefits across the whole industry chain，and unified operation naturally becomes its defining feature. From the perspective of national GDP accounting of agriculture-related industries，this report observes this defining feature of the rural collective economic system，and finds the following. （1）Collective economy and unified operation are virtually as inseparable as a twin. The operation system of “three-level cooperatives （at the township level，village level or group level） plus three-level companies （head office，specialized companies and market-oriented companies）” for coordinating village-wide space and industries can be found in virtually all rural collective economic organizations in all areas and all stages of development. The existence of the same structure in so many of collective economic organizations reflects their inherent preference and rigid demand for unified operation. （2）According to the input-output table，agriculture-related industries accounted for 21.28% of the country’s GDP in 2019，three times the proportion of traditional agriculture （7.10%），revealing the objective justifiability of unified operation of the collective economy. The unified operation of the collective economy determines its fundamental position in developing rural industries as obviously the only and irreplaceable solution.