| With the promulgation of the "Opinions on Accelerating the Development of the Sports Industry and Promoting Sports Consumption" and other relevant documents,the Internet industry and sports industry are moving towards a fast lane of accelerated integration.Nowadays,while the sports fitness apps represented by head software such as KEEP,(Huawei)Health and Zepp life are developing rapidly,the retention rate of users is not optimistic.To sum up,how to improve users’ willingness to continuously use the sports fitness app has become a problem that can not be ignored..From the perspective of fitness APP’s function,based on SDT(self-determination theory),this study constructs the model.Specifically,we divided the functions into 3categories: gamification,quantified-self and social networking,and users’ basic psychological needs satisfaction into autonomy need satisfaction,relatedness need satisfaction and competence need satisfaction.We explored what types of basic psychological needs each function can meet,it opened the "black box" between system function design and users’ need satisfaction.Then,we introduce emotional attachment,and propose that the users’ basic psychological needs satisfaction will promote users’ emotional attachment to fitness app,and then form a willingness to continue to use it.In this paper,the questionnaire survey method was used to verify the above research model.The results show that gamification and quantified-self are positively related to users’ autonomy need satisfaction and competence need satisfaction.Social networking is positively related to users ’ relatedness need satisfaction and competence need satisfaction,while negatively related to users’ autonomy need satisfaction.Relatedness need satisfaction and competence need satisfaction are positively related to emotional attachment,while autonomy need satisfaction is not.Emotional attachment is positively related to continuous use intention of fitness APP.Besides,emotional attachment plays a partial mediation role in the relationship between competence need satisfaction and continuous use intention,while plays a full mediation role in the relationship between relatedness need satisfaction and continuous use intention.Finally,there is a chain mediating effect between competence need satisfaction and emotional attachment in gamification,quantified-self,social networking and continuous use intention;there is a chain mediating effect between relatedness need satisfaction and emotional attachment in social networking and continuous use intention.This paper enriches the research on the continuous use intention about fitness APP.Meanwhile,the result of this study can also provide some basis and suggestions for the renewal,iteration and operation management of fitness app,also help enterprises continue to attract users to use their products.It also contributes to the national fitness programme. |