The theoretical model illustrates the relationship between the implementation of corporate social responsibility (CSR) on customer loyalty in the banking industry through intermediary variables that are bank reputation and customer trust. The research was conducted in two stages. The first one is preliminary research that seeks to adjust and modify observed variables used in previous studies to fit the context of banking products in Da Lat City. Preliminary qualitative method was carried out via direct interviews with bank managers and customers in Da Lat City and preliminary quantitative research was conducted via a structured survey with a sample size of 150. The purpose of this stage is to evaluate the reliability and the monotonicity of the scale using SPSS 20 software. The main research was conducted via a detail structured survey with 350 customers in Da Lat City to evaluate the reliability and validity of the scale and test the hypotheses of the research model. The Cronbach’s Alpha reliability analysis, exploratory factor analysis (EFA), confirmatory factor analysis (CFA) and structural equation modeling (SEM) was performed on AMOS 20 software. The results indicate that three CSR activities of banks have a direct impact on their reputation which affects trust and trust, in turn, affects customer loyalty. Some suggestions for the bank managers were also proposed.