According to the paper query, branches of social organizations, foundations and social service institutions (private non-enterprise units) are not regarded as separate census objects, and relevant data are included in legal entities. Internal organization is a part of the internal business activities of the unit. Dividing the unit types of internal institutions is actually the concretization of the identification methods of legal person units, industrial activity units and self-employed households. Therefore, in the actual inventory, enumerators mainly refer to the identification methods of the above-mentioned legal entities, industrial activity units and self-employed households. An internal organization that meets the conditions of a legal person is recognized as a legal person unit; Internal institutions that meet the conditions of industrial activity units are recognized as industrial activity units; Those who meet the conditions of self-employed are identified as self-employed; Do not meet the above conditions, not as a separate census object.