本文对刑事诉讼二审因“事实不清、证据不足”发回重审的原因进行了分析,认为该制度在实际操作中存在损害刑事二审的功能、违反无罪推定原则、规避“上诉不加刑”原则、引发检察机关对被告人的行为进行反复追诉、导致法院内部的矛盾冲突等弊端,提出了强化二审功能、一审法院应严格把关,将“事实不清、证据不足”的案件解决在立案前和判决前、公安、检察机关和法院都应当切实贯彻和落实对嫌疑人、被告人人身权利和诉讼权利的保障等进一步完善建议。 This paper analyzes the reasons for the second instance of criminal procedure because of “unclear facts and insufficient evidence”, and thinks that this system has the function of damaging the second instance in practice, violates the principle of presumption of innocence and avoids appeals The principle of “increasing the punishment”, triggering the procuratorial organs to prosecute repeatedly the defendant’s behavior, leading to conflicts such as conflicts within the court and other shortcomings, proposed to strengthen the second instance, the court of first instance should be strictly controlled, the “fact is not clear, insufficient evidence” Prior to the establishment of the case and before the verdict, the public security, procuratorial organs and courts should earnestly implement and implement the recommendations on the improvement of the rights of suspects and defendants and the protection of litigation rights.