This trail is the first study to test the efficacy of nurse-led clinics cognitive training on mild cognitive impairment (MCI) patients using a single-blind, randomized controlled trial design. The investigators hypothesize that nurse-led clinics cognitive training can (a)decelerate or ameliorate cognitive decline, (b)ameliorate anxiety and depressive symptoms, (c)increase the quality of life for both patients and family members, (d)improve the ability of daily life, (e)reduce the incidence of agitation.