Family, because of its fundamental and important role in the society, has been supported by the legislature penally in the law systems of different countries.

Compilers of the Islamic criminal law have not neglected to pay attention to this substantial element and in the chapter 19 of the fifth book of the Islamic criminal law (crimes against the rights, and duties of family) they have supported the values and members of the family and have devoted 6 law articles to this subject.

In this thesis, after the definition of the" penal policy", the penal policy of the Iranian legislature about the crimes on the articles 642 – 647 of the Islamic criminal law (crimes against the rights and duties of the family) has been considered.

The above-mentioned have been studied under the following titles: "refusing the maintenance" ,"marring a woman already married" ,"wedding a married woman with another man" ,"not register the marriage contracted officially, divorce and revocation" ,"getting married with the minor" ,and "deception in the marriage" .

And in this thesis the law element, actus reus and mens rea of this crimes have been studied, too.

After considering the consisting elements of the said crimes and the circumstances of their realization, the determined punishment for this crimes have been analyzed.

This thesis answers this question that" Whether the determined penal policy for these crimes has been suitable and able to support the framework of the family or not? "

Finally, suggestions have been offered for reforming the determined penal policy for the sake of supporting the framework of the family.