Abstract: The comparability in comparative study field requires the similarities or correlation, as well as the differences or heterogeneity between the comparison objects, which is the essential characteristic and the logical foundation for the existence of comparable study.However, in the field of comparative sport research in China, quite a lot often neglect the investigation and analysis of "the comparability" between comparison objects, with the assumption, reference or transplant of the "simple comparison" instead, resulting in the deviation and paradox of the conclusion.This study, with "the background comparability" as a model, makes an insightful investigation and analysis into some of the results related to the comparative study of sport in our country, and expounds some paradoxes resulting from the ignorance of "comparability", for the purpose of the researchers'attention.