The crime of causing traffic accidents is a negligent crime, and the mentality of the parties is identified as overconfident knife-wielding crime and negligence, which fails to avoid traffic accidents. Therefore, the punishment for criminals is relatively light. Because the crime is not the malice of the parties, but the fault of the parties, it is also necessary to give a lenient punishment in combination with the mentality of the criminals after committing the crime, which embodies the fairness and justice of the law and the humanistic care of the law itself. Suspected of traffic accidents can not plead guilty; A lawyer may decide not to plead guilty if he examines the facts and evidence comprehensively and carefully and thinks that it meets the requirements. For example, if the criminal suspect is suspected of causing traffic accidents, the defender can prove that the Letter of Confirmation of Traffic Accidents was hastily made by the police handling the case, and that the accident facts and applicable laws are wrong, the letter of confirmation cannot be used as the basis for criminal filing, further examination, prosecution and trial of traffic accidents. A plea of not guilty may succeed.