The Comprehensive Geriatric Assessment (CGA) offers practical coping strategies and resources to meet the specific needs of the elderly patients. With the professional knowledge and background, the clinical psychologist in CGA could provide specific assistances to elderly patients, their caregivers and even medical care team members. It is expected that clinical psychologists could help elderly patients to enhance their living abilities and quality of lives. From a clinical psychologist's point of view, the article first introduces the emotion and cognition assessments based on the features of elderly patients. It then further discusses the advantage and disadvantage of scales that are frequently used in Taiwan. Meanwhile, the article also comments on the application and interpretation of these scales. After assessing patients, the clinical psychologist would arrange a reasonable cognitive rehabilitation program and provide adequate emotional support by considering the stepwise goal, the patient's cognitive ability and emotional state, the living environment, and other possible influential factors. In addition, the clinical psychologist could also assist family caregivers to realize the patient's symptoms, and help them to form a rational expectation. The clinical psychologist's coordination would be helpful in minimizing the distinction between caregivers' anticipation and patient's need, as well as in keeping sufficient communication and family resource allocation. Furthermore, in order to improve the quality of medical care, the clinical psychologist endeavors to build up a good relationship among medical staffs and patients. The clinical psychologist would also encourage the integration of professional suggestions in the medical team. More than that, the clinical psychologist could help medical staffs to improve their practices by perceiving their own emotional experiences that are generated during working.