Abstract: "Productivity paradox"has become a hot topic. The paper first examined the "productivity paradox" of sports goods enterprises in China by statistics and quantitative methods, finding that the "self-selection effect" of sports goods enterprises is negative, and the empirical results support the statement that there is "productivity paradox" in sports goods export enterprises, i.e. the productivity of sports goods export enterprises is lower than that of non-export enterprises. Then the paper examined the impact of the productivity of sports goods enterprises on export scale, finding that productivity, output and profitability have an important impact on export scale. Finally the paper analyzed the reasons why there is "productivity paradox" in sports goods enterprises, and proposed some enlightenment form the above findings.

Key words: heterogeneity enterprise, productivity paradox, self-selection effect, sport goods industry, export enterprises, non-export enterprises