At present some shortcomings exist in the teaching on the investigation in terms of special criminal cases in the public security institutes, which are mainly represented by important points not stressed in the materials and some divorce between teaching and learning.

On Criminal Policy of Coordinating Leniency and Harsh Punishment and Its Practice in Lawsuits;

On the increase of the flow crime this years,the exertion and research on the incorporated investigation will be more important.

Case linkage is very important to incorporated investigation.

On Adjudication Based on the Investigation Files——Reexamination of the Criminal Procedure of Second Instance in China;

This article analyzes briefly the thinking process of problem solution in case investigation,the tactical selection of investigation behavior and the psychological factors which affect problem solution and tactical selection.

Using disjunctive analogy in case investigation is benefit to getting rid of some questionable points,which can stress the investigation essentials,gather investigation power,and close to the investigation target.

In case investigation, we could utilize mentally imprint to analyses criminal intent of criminal ,intention when commiting crime and mental characteristics of individual, help investigator to investigate and ascertain the corpus delicti with highly .