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Purpose: This study explores whether simplified Tai Chi can improve the balance ability of the elderly and provides a theoretical basis for studying fall prevention among the elderly. Methods: A three-dimensional force plate was used to test the balance of 30 healthy elderly. Balance ability was tested by using four postures, namely, standing with both eyes open,standing with both eyes closed,standing with one eye open, and standing with one eyeclosed.Results: The DO RMS-AP, DO RMS-ML, SC COP-ML, and SOT indexes of the Tai hi group were significantly higher than those of the control group. Conclusion: Simplified Tai Chi can improve the balance ability of the elderly. If one wants to improve his/her posture control ability when standing with one eye closed, then s/he needs to practice tai chi for an extended period.