Objective:To explore the changes of hip joint function in patients with total hip arthroplasty (THA) within three months after operation, and to explore the impact of fear of falling on hip joint function recovery.Methods:From December 2020 to August 2021, 205 patients with THA after operation in the Xinjiang Uygur Municipal People's Hospital were selected as the study subject by objective sampling. The patients were investigated with the General Information Questionnaire, the Chinese version of Falls Efficacy Scale-International (FES-I) , and the Harris Hip Score after the first activity out of bed, one month and three months after operation. Pearson correlation was used to analyze the correlation between the scores of FES-I in Chinese version and the scores of Harris Hip Score in different periods after operation, and multiple linear regression were used to analyze the influencing factors of hip joint function recovery in different periods after operation.Results:After the first activity out of bed, one month and three months after operation, the FES-I scores of 205 patients after THA were (32.24±6.05) , (30.94±6.04) and (28.48±3.52) respectively, and the scores of Harris Hip Score were (61.49±8.92) , (72.58±5.52) and (89.15±5.70) respectively, and the correlation analysis showed that they were negatively correlated ( r=-0.512, -0.523, -0.549; P<0.05) . The results of multiple linear regression analysis showed that age and fear of falling were the influencing factors for the hip joint function recovery when THA patients got out of bed for the first time after operation ( P<0.05) , which could explain 31.2% of the total variation. Sex, age, number of concomitant diseases and fear of falling were the influencing factors of hip joint function recovery in THA patients one month after operation ( P<0.05) , which could explain 43.7% of the total variation. Sex, age, number of concomitant diseases and fear of falling were the influencing factors of hip joint function recovery in THA patients three months after operation ( P<0.05) , which could explain 36.9% of the total variation. Conclusions:The recovery of hip joint function in THA patients shows an overall upward trend three months after operation. The impact of fear of falling on the recovery of hip joint function in different periods persists. The higher the level of fear of falling, the worse the recovery of hip joint function. Nurses should evaluate the patients' fear of falling at different periods after operation, and strengthen the attention and guidance to patients with high fear of falling, elderly patients, and patients with other diseases, so as to promote the recovery of patients' joint function.