At present, the investigation jurisdiction of criminal cases on passenger train is the main cause to the ineffective attacks on the offences and crimes on passenger train.

The handwriting sample in criminal cases is the handwriting material that is used for comparison with the examine material, which is written by the suspects who are confirmed through investigation.

This article argues that because of the peculiarities of economic crimes, the principles and managing mechanisms are different from those for criminal cases, and therefore, contain special contents.