Mild cognitive impairment (MCI), an intermediate stage between normal cognitive aging and dementia, is defined as cognitive decline greater than expected for a person’s age and education level that does not significantly interfere with activities of daily life.1 Up to approximately 80% of people with MCI may progress to dementia within 5 years.2 Tai chi (TC) as a gentle aerobic exercise has been shown to provide benefits in the treatment and rehabilitation of many medical conditions. Practising TC may improve cognitive function. However, few randomized controlled trials (RCTs) have examined the effects of TC on MCI, and they have done so with controversial results.1, 3, 4 We conducted this systematic review of RCT to investigate the efficacy of TC for individuals with MCI.