The purpose of this study was to produce an accurate of information source, the right to also effectively and efficiently in carrying out marketing management in accordance with technological developments. This research method is qualitative research with descriptive approach. The focus of this research is to understand the overview of web-based marketing information systems and understand the overview of web-based marketing information system in support of marketing management that applied at CV. Karya Gaja Mandiri. Marketing information systems is become important thing for company in solving the marketing issues and analyzing the ways of company in competing with the others competitors, therefore the company can survive in the business competition. The results of this study are indicate several ways in marketing the product by online media using technique SEO (Search Engine Optimization) in attracting visitors online media and using DSS (Decision Support Systems) in planning the marketing strategies to create marketing activities can be run effectively and efficiently.