This law system should conclude three categories: inter-regional concurrent criminal jurisdiction; inter-regional criminal assistance in China; inter-regional uniform criminal law.

The normalization of China s interregional judicial assistance in criminal cases is a long and gradual process,which can be classified into three steps:signing agreements of the interregional judicial assistance in criminal cases;proclaiming"the model law of China s interregional judicial assistance";drafting "China s judicial assistance law".

In China, the subjects of interregional judicial assistance in criminal cases refer to the following four legal districts as Mainland, Hong Kong, Macao and Taiwan, which the functional departments of above assistances refer to those that operate practical judicial assistance in criminal cases.

Owing to the character, "one nation, two systems and poly-legal families", China s interregional judicial assistance in criminal cases becomes a trans-subjects problem involved the related subjects as international public law, international private law, criminal law, criminal procedure law, and so on, hence the researches on it have been always in the ascendant.

Research on the Establishment of International Criminal Judicial Assistance of PRC;

International criminal judicial assistance is activities between sovereign states, whereby assistance or service as proxy is offered in handing of criminal proceedings or execution of criminal entity rights pursuant to relevant international treaties or reciprocal principle.