Objective To investigate the effects of application of functional training to Haglund disease patients with mild cognitive impairment. Methods The functional training group was built and gave functional training to 46 patients of Haglund disease with mild cognitive impairment. The period of intervention lasted 6 months. Before and after the training, We assessed patients in terms of scores of Baird-Jackson ankle joint, self-efficacy and clinical efficacy. Results After the training, scores of Baird-Jackson ankle joint and self-efficacy became higher and the excellent rate of clinical efficacy has risen. Compared with those before the training, the difference had statistic significance (P<0.01). Conclusion Functional training has a positive impact on the recovery of ankle joint function of Haglund disease patients with mild cognitive impairment and improve their self-efficacy.