Ben Tre, located in the Mekong Delta, is one of the most places affected by climate change, especially in sea level rise and salinity intrusion. For the seven provinces bordering the East Sea, the need for monitoring water resources is critical. This paper represents an approach to build a web-based GIS to store, manage, analyze and visualize the data of saline intrusion phenomenon. The novelty focuses on automating the workflow for the generation and publication of time series saline intrusion maps on server side. The analysis results are provided on the web browser interface. This helps users access valuable information without having to install professional GIS software. Spatial distribution of saline intrusion and statistical results support government agencies in planning and decision making. This work is funded by Ben Tre Provincial People's Committee and Vietnam Academy of Science and Technology (VAST).