The purpose of this study was to analyze the architect's Administrative Tribunal cases related to housing projects. We collected the 271 decisions of Administrative Tribunal cases from 1985 to 2001 through the Ministry of Legislation data base. As a conclusion of research, most of cases are caused during design process and supervision of construction which are major roles of architects. We can find out that the number of cases of Administrative Tribunal about housing is 10% more than other types of building. And this situation is more serious in supervision building phase. It proves that housing project has more possibility of violation of law than other types. Because it belong to an economic problems. In Korea, clients of housing project tend to take more profits by taking an illegal acts； like enlargement of a building, construction border violation. illegal construction balcony and so on. And architect who roles to be a supervisor is liable to these problems but he has not much authority and economical benefits. Through this research we can analyze this situation and make know what is problem.