The education of disorders understanding is an important issue for students of teacher-training course. In one teaching professional class, students visited the children's development support facilities. Students responded three times to the survey of the Disorders image by SD method. The first test was checked before the visiting, the second was immediately after it, and third was two months after it. Although assessment of the positive image has been increased after the visiting, many of the students were decreased to two months later. However, in a certain number of students it showed the tendency of the positive image is increased or maintain even after two months. This phenomenon has been discussed as the effect associated with the "sleeper-effect ".