本文主要对刑法实务案例与原理进行了研究,首先对刑法进行了概述,包括刑法的概念、任务、效力及基本原则,其次阐述了犯罪的构成,要根据刑罚的总则对犯罪的主体、犯罪的客体、犯罪的主观方面、犯罪的客观方面、故意犯罪过程中的形态、共犯、数罪、刑罚几个方面对实务案例进行分析,再次,对正当防卫限度进行了分析,第四,对刑法实务问题进行了研究。 This article mainly studies the case and the principle of the criminal law practice. At first, it gives an overview of the criminal law, including the concept, mission, effectiveness and basic principles of the criminal law. Secondly, it elaborates on the constitution of the crime. According to the principle of the penalty, Object, the subjective aspect of crime, the objective aspect of crime, the form in the process of intentional crime, the accomplice, the number of crimes and the punishment. Then it analyzes the limitation of justifiable defense again. Fourthly, The problem was studied.