The purpose of this study is to explore the method of caring chronic patients and the effect on caring quality from primary caregivers who have been educationally trained. The objectives of the study are for chronic patients and primary caregivers in Medical Center. The study design applies retrospective method. The experimental group contains 30 patients from chronic ward and their educated primary caregivers. The control group selects 30 patients from acute ward and their conditions are similar to those from chronic ward. The questionnaires are collected by direct interview. The trained interviewers really observe situation of care by nurse staffs and caregivers, then fill up the Quality of Care Questionnaires. The results of this study show that 90 percent of primary caregivers are nurse-aides. After primary caregivers accept training from nurse staffs, it is obviously that the quality of care by trained caregivers is better than untrained ones. The research results give us a way in clinical nursing to care those patient better.