There are many circumstances under which an official's property could be confiscated after being suspected of a certain crime. This study focuses on the crime of treason, and analyzes the issues related to the confiscation of family properties. The confiscation of family properties that followed the crime of treason was not done according to the domicile address of the criminal. It was done according to whether the confiscated property was common property of the criminal and his family. The confiscation of family properties was a compulsorily enforced law. It differed from the way civilians separated wealth among the family, and did not divide the belongings by force. If the property did not belong to the criminal or family members deemed guilty by blood association, the rightful owners could still be spared of the confiscation. Such a confiscation had to be conducted with an audit by an auditing official, but in the latter part of the Tang, it was often handled by a eunuch sent by the emperor. The confiscated properties should be kept by various financial authorities, but after the middle of the Tang Dynasty, they were integrated into the emperor's private purse in order to emphasize his authority and power. The crime of treason could sometimes be annulled due to political changes. In such a case, the confiscated goods would be returned to the family only under special authorization of the emperor. It would be more difficult and complicated to return the goods to the family if they already had been granted as rewards to the emperor's subjects.