Traditional market is a market that has important role to promoting economic growth in Indonesia. It has a natural competitive advantage. Semarang city as the capital of Central Java is still maintaining the traditional markets while the modern market is rapidly increasing. Provision of information about traditional markets becomes very important to socialize its location and information to the public. This study attempt to create an application of Geographic Information System (GIS) web based about traditional market in Semarang. WebGIS is a geographic information system applications that can be accessed online through the website. This application using the software XAMPP as localhost, Dreamweaver and Notepad ++ to create a website design and coding process. Google Maps as an online map that displays the location of markets. The final result of this research is the application of GISbased web for mapping the traditional market in the city of Semarang that is accessible to the public by online. This application also features by the location of market routes nearby to provide an information for public as well as their needs.