In December 2015, we have made a survey on 67 small and medium-sized businesses having an account in one of the seven main banks operating in Bukavu City. The aim was to know the determining factors of a Bank by the Bukavu’s small and medium-sized businesses which can assist these financial institutions in marketing strategies. The analytical method sustained by the survey technique was very useful for to collect and interpret the data on the field. The findings proved that several factors intervene in the choice of a Bank as a partner to small and medium-sized businesses in the Bukavu City. Among them we listed the price cost of granted services by the Bank, loan facility, service’s quality solvency and the Bank reputation. Considering these variables, the marketing services of our different Banks should focus their marketing strategies to the above mentioned factors in order to attract customers.