The modern condition of business environments has made use of some processes and systems to control effects of such environments and continuity of activity through the organizations “inevitable”. From among these processes and systems, it can be referred to the most important one i.e. sales and marketing information system. This research was carried out with the aim of studying role of sales and marketing information systems in increase of companies’ sales rate through the use of descriptive-survey research method. The present study includes seven (7) hypotheses. Senior managers and marketing managers of five vegetable oil production companies are considered subject of this study, in which, its sample size was calculated 93 persons through the use of Cochran Formula. Simple random sampling method was used for selecting sample.
Questionnaire was used for collecting data. The reliability of the questionnaire was obtained 0.96 through Cronbach’s Alpha Method. The results of statistical tests showed that sales and marketing information systems are effective in increase of companies’ sales rate.