Indicative abstract: Financial security ought to be built on a strict financial legal system; the criminal law should also have effective regulations and governance on fighting the financial crimes. Under the background of financial marketization, some potential financial risks transform into financial crimes. Taking the tendency of functionalism of the criminal law into account, financial crime circle has the possibility of being further expanded improperly and the serious divorce between financial administrative regulations and the criminal law. As a result, we need to re-examine the administrative crime theory. The difficult problem of criminalization that the modern criminal legislation confronted is not against the natural crime but the administrative crime. With the development of society, the proportion of administrative crime in criminal law regulation is increasing, even tends to be more than natural crime. The legislation of the administrative crime is also different from the mala in se and has its own characteristics; that is, what kind of behavior constitutes a crime and what does harm to the society differ on the different laws in different countries or at different times in the same country. In terms of the nature of administrative crime, the criminal law uses the qualitative and quantitative analysis pattern to define the crimes, which includes both the study on the nature of behavior and the comment on the “quantity” of the behavior. It is significant that reaching a certain number decides whether some behavior has constituted a crime or not. Criminalization bases on the fact of having the “serious social harmfulness” in the quantitative and qualitative factors. In terms of the infringement of the legal interest by administrative crimes, the legal order formed by administrative law should be taken as the form of the legal interest and the secondary legal interest by administrative crimes infringed. In terms of financial crime, a typical kind of administrative crimes, the legislators regard the financial management order as the first legal interest to protect (it is the sole legal interest in some charges), but the specific property interest as the secondary-protection interest. However, the legal interest should be comprehended as the abstract social order value protected by the laws, which will benefit the whole society and may be assigned to the individual or entity as the subject of the legal interest. From the birth of the theory of risk society , all the countries spare no effort in using the legal means to regulate the risks, and there is no exception in the criminal legislation, which led directly to the increasing proportion of administrative legislation and the expansion of the criminal law. In terms of the criminal policy which influences the legislation of administrative criminal, to some extent, the theory of risk criminal law, has its rationality; however, the legislative practice of the administrative crime must be cautious and rational, instead of expanding blindly and unrestrainedly.