We investigated a prejudiced idea of nursing students against mental patients before and after psychiatric practicing. On investigation we found the following facts. 1 Before psychiatric practicing, 84.1 percent of nursing students had a prejudice against mental patients. Those students thought that mental patients were fearful and could not communicate with students. 2 Afer psychiatric practicing, 48.8 percent of nursing students put prejudices. 3 After psychiatric practicing nursing students undersand that mental patients are the same as people in general.