Severe slugging is the condition at which the liquid slugs are formed and violently blow out from the riser. It may lead to an unstable flow rate, causing the fluctuation of the gas production. Thus, it should be avoided to prevent operational problems in the field. One of the solutions is by using the multiphase dynamic flow simulators. This project aims to implement a Graphical User Interface (GUI) of a simplified severe slugging model. The work is based on a previous Matlab implemented in Python language and specialization project. To achieve the objectives, the project was structured into three parts. The project initiated with reviewing the previous severe slugging calculation, review well-known transition criteria. The second part of the project was implementing a GUI of the model by considering several main features such as plot results, export, flow regime transition map and severe slugging stability map. In the final step, a comparison between flow regime maps and severe slugging stability maps was conducted. The project showed the successful design and implementation of GUI that can simulate the flow regime map and severe slugging stability map.