“一事不二罚”原则被我国确立为行政处罚的一大原则之后,规范了原有的多头处罚现象。在海事行政处罚的过程中,对数行为违法应定义为一事或是多事,在一事不二罚原则限制下,有了实质的不同。本文通过相关理论和常规法律解释定义了同一违法行为,并通过案例分析“一事不二罚”与“法条竞合”在内河海事行政处罚中的理解与运用。 After the principle of “one thing and one thing is fine” was standardized by our country as a major principle of administrative punishment, the original long punishment was regulated. In the process of maritime administrative punishment, the law of logarithmic acts should be defined as one or more things, with substantial differences under the principle of one good service. This article defines the same illegal act through the related theories and the common legal interpretation, and through the case analysis, the understanding and application of the “one good and one fine” and the “legal equivalent” in the inland maritime administrative penalty.