犯罪后自首又有重大立功表现是我国刑法中规定的对犯罪分子从宽处罚的制度,它体现了我国刑法惩办与宽大相结合的基本刑事政策,有利于分化瓦解犯罪分子,预防犯罪。但是该条款概念规定模糊,司法实践中易造成歧义,且现行刑法对之采取绝对从宽处罚,确实有其不足之处,有待立法的近一步完善与修改。 It is a system of punishing criminals leniently as stipulated in our criminal law. It reflects the basic criminal policy of criminal punishment combined with leniency in criminal law, which is conducive to the division and disintegration of criminals and crime prevention. However, the concept of the article is ambiguous, the judicial practice is easy to cause ambiguity, and the current criminal law imposes absolute leniency on it. There are indeed some shortcomings, pending further improvement and revision of the legislation.