共犯是英美刑法共同犯罪理论中研究的重点内容,也存在着颇多争议。共犯刑罚的根据是什么,即共犯为什么需要承担刑事责任;如何判断行为人是否是共犯;共犯不需要承担刑事责任的合法辩护事由有哪些等等。本文将对这些问题进行介绍和探讨。 Accomplices are the key points in the study of common criminal law in Anglo-American criminal law. There are also many controversies. What is the basis for the accomplice’s sentence, that is why the accomplice need to bear the criminal liability; how to judge whether the perpetrator is an accomplice; what are the legal defense reasons why the accomplice need not bear the criminal responsibility and so on. This article will introduce and discuss these issues.