Finnish mental health care went through a major change in the 1980s. Its institutions were being run down and there was a shift to a caring system that stresses non-institutional practices. The schooling and work of the mental health nurse had to adapt to the new situation. The purpose of my study was to describe and analyse the mental health nurse's work, i.e. caring, as it is experienced by a nurse in the preparation of long-term psychiatric patients for non-institutional care. The data consist of repeated interviews with Vuokko, who has been a mental health nurse for about 30 years and is now approaching her retirement. In the light of the data, the central features of caring are caring about and taking an overall responsibility for the patient, and teaching the patient to cope with everyday life. Caring is based on practical knowledge, the essential elements of which are intimacy and feelings.