补充侦查是指刑事诉讼进入一定阶段以后,由于发现案件中存在着需要进一步侦查的情况,以补充原来侦查中未能解决或解决得不好的问题,由负责侦查的机关对案件按照法律规定进一步查清事实、补充证据的诉讼活动。①补充侦查作为一项刑事诉讼活动,在一定时期仍有存在的必要性,它依赖 Supplementary investigation refers to the criminal proceedings into a certain stage, the discovery of the case there is the need for further investigation to supplement the original investigation failed to solve or not properly solved the problem, by the responsible for the investigation of the case in accordance with the law further Find out the facts, add evidence of litigation activities. ① As a criminal procedure, the supplementary investigation still needs to exist for a certain period of time, and it depends on