Inclusion Criteria:  Equal to or older than 60 years old The SPMSQ scores range from 4-7 ( illiterate: 4-5, elementary: 5-6, junior high school: 6-7) or Clinical Dementia Rating Scale (CDR): 0.5 Be able to communicate in Mandarin or Taiwanese Has the ability to see and hear well enough to follow the instructions Agree to participate in this study.  Exclusion Criteria:  Activity restrictions from physician recommendation Unstable disease progress could affect their participation Surgery for joints or spinal cord within 6 months Unable to walk 50 meters with the assistant device Learning disability