This study was conducted to identify predictive factors of physical activity in total hip arthroplasty patients, and to provide basic data for the developing physical activity promotion program for total hip arthroplasty patients. Design: Descriptive correlational research.Methods: Data were collected from August 2017 to May 2018. Surveys were distributed to 60 patients in a G university hospital located at J city, Gyeongsangnam-do. Data were analyzed by frequency, mean, standard deviation, t-test, ANOVA, Pearson's correlation coefficient, multiple regression analysis using SPSS 24 Win program. Results: The variables affecting the 4-week physical activity after discharge were age (β ＝.07), residence after discharge (β ＝ -.22), cerebrovascular disease (β ＝-.13), mental and behavioural disease (β ＝-.11), taking antibiotic (β ＝-.26), walking ability (β ＝.41), nutritional status (β ＝.25), depression (β ＝.05). The eight variables accounted for 39.4% in the 4-week physical activity (F＝4.49 p＝.001). The variables affecting the 8-week physical activity after discharge were age (β ＝.06), waking ability (β ＝.34), nutritional status (β ＝.20), exercise self-efficacy (β ＝.05), depression (β ＝-.05). The six variables accounted for 28.0% in the 8-week physical activity (F＝4.58, p＜.001). Conclusions:The walking ability in discharge important to improve the physical activity, there is a need to develop an program to improve walking ability before discharge, in total hip arthroplasty. There is a need to develop a physical activity program to consistently participate in a community.