In China,the present laws has achieved progress in non-prosecution on suspected crime,but there stll exists some problems such as general standard of suspected crime,relevant participants lack of chances of cross-examination,and the judicial authorities disregard of procedure.

The present procedure of non-prosecution on suspected crime should be further reformed,including the aggrieved party s participation,the establishment of non-prosecution hearing system and judicial system,the introduction of state compensation system and perfection of procuration and legal aid.

The system of non-prosecution on suspected crime reflects the implementation of the presumption of innocence in China,but it also results in the uncertainty about the facts and evidences of the cases.

In judicial practice,due to certain situations,some cases are makes the decision of non-prosecution with doubt for reasonable doubts are hard to exclude;this is only the stop of the procedure but the sentence of "not guilty" substantially.

The non-prosecution with doubts is an important component of the system of nol pros in our country,and embodies the modern justice conception of no punishment in doubtful cases.

The cases of non-prosecution with doubts have a certain fact of crime.

The doubtful crime cognised in fact is a status which has formed judiciary accusation,but its guilty belief could not reach sue or conviction Standard,and criminal allegation could be proved neither true nor false.