Labor standard law has a unique position in the labor law system. To understand its notion, we should strengthen its connotation characteristics so as to narrow down and judge its extension. Compared with "standard", "benchmark" can better convey the original meaning of legal notions. The adoption of its narrow notion of the labor standard law is determined by the public law nature of the labor standard law. Although the labor standard law is included in the public law, it also has the effect of private law. Therefore, its extension cannot be expanded by considering it as a public-private integration law. Even if the labor standard constitutes the collateral obligation of the labor contract at the same time, and the labor contract law contains the forced operation rules of labor relations, which does not affect the independent positioning of the labor standard law and the labor contract law in the internal system of the labor law.