To make a thorough understanding of social phenomena and to explore the laws, we must enter the real society to find information, and we must not think about it in a vacuum. We must understand the causality of things and establish relevant theories. For theoretical use. Can it be launched from this? ['People engaged in social research must also be engaged in practical work.', 'To engage in social research, you must collect information from actual work.', 'Social research based on substantive data is not theoretical.', 'Social research only needs substantive information.']