Normative dominance theory, taking reliance of legal benefits on dominators' behaviors as a realistic basis, and expectation for dominators' behaviors from society as a normative basis, advocates that the existence of realistic dominance or normative fictional dominance can both be identified as the presence of substantive basis of duties. The above mentioned ″reliance of legal benefits on dominators' behaviors″ refers to preservation of legal benefits which depends on dominators to direct the cause and effect flow towards orientation of avoiding damages. This reliance is reality-oriented, which is the realistic basis of dominance. The above mentioned ″expectation for dominators' behaviors from society″means that the society has expectation for the rational behaviors adopted by dominators who take the dominant position in cause and effect flow of legal benefits damages to preserve legal benefits. This expectation constitutes the normative reason of the society to expect dominators to adopt legal benefits preservation actions. The definition of dominance in normative dominance theory includes multiple layers, that is, the idea of dominance, realistic dominance behaviors and dominance possibilities, etc. It is a complex concept that gathers the subjectivity and objectivity, and reality and possibility together. More importantly, the concept of dominance can even surpass the position as an intrinsic identification of the doer and enter into the field of social function and social evaluation, which becomes the bridge to conduct substantive behaviors facing realistic social activities as duties. Including the value judgment, this normative dominance cannot be solely decided from the level of facts. The judgment standards of dominance include three elements: the possibility, equipollence, and superiority of dominance. The possibility of dominance refers to the possibility of the doer to prevent harmful consequences from happening. The equipollence of dominance means that dominance must conform to the empirical law of mass social life. According to the mass social life experience, accidental dominance or fictional dominance which does not meet the empirical law should be excluded from the scope of duties. The superiority of dominance requires that the obligor shall have certain superiority in the dominance possibility of legal benefits cause and effect flow compared with the mass, while exclusive dominance of the doer in cause and effect flow is not necessarily required. As the substantial origin of legal duties, normative dominance theory reasonably defines the scope of legal duties, benefits the establishment of reasonable measuring criteria of illegality degree, and has the advantage in helping to ensure the independence of penal law etc. Meanwhile, it also has broad theoretical explanatory power, so the normative dominance theory is worth advocating and implementing.