The main purpose of this paper is to discuss the concept of information privacy, to explore the threat formed databases in the information age and try to examine the constitutionality of household registration system in Taiwan and advocates the construction of information laws. Traditionally, the concept of privacy is considered as the right to "intimate affairs", such as: freedom from harassment in the residential space of, the secrecy of personal letters and the decision of private matters (marriage, breeding and so on). But in the information age, as the rapid development of science and technology have affected people's expectations of privacy and therefore have gradually eroded the core of privacy, which is personal autonomy. The concept of privacy should be shifted and given it new life, that is, information privacy should be understood as the right of controlling personal information. Under the policy of Taiwan government, personal information collected in household registration has been computerized and connected to the Internet. Various government agencies could easily use the household registration information and people could even use the personal computers to apply for electronic household registration information. The household registration policy, although significantly enhance the government's administrative efficiency, but on the other hand has greatly weakened the people of control over personal information. This paper contend that the household registration database has seriously infringed upon the constitutional protection of privacy of information and the legislators should immediately revise and augment the articles to protect information privacy in household registration law. Chapter I talks about the study motivation, research methods and scope. Chapter II introduces the history of household registration in Taiwan, the legal system of it and the crisis of information privacy caused by it. Chapter III is to explore the concept of privacy. Chapter IV is concerned about information privacy itself that is different from the traditional concept of privacy. Chapter V reviews constitutionality of the databases made by household registration in Taiwan and proposes amending the laws to protecting information privacy. Chapter VI is the conclusions.