This research is about the development of an EIA decision support system that effectively integrates and visualizes the results of the EIA review process and related information such as BIM/GIS, modeling data, and sensor data. The final goal is to improve the EIA process so that not only experts but also non-experts can participate in the EIA process and easily understand the EIA statemnets using innovative technologies such as 3D GIS and Easy Finger real-time simulation. The final system will be developed and opend as an open source. This research is 5 years long project funded by Minstry of Environment, South Korea. This talk will focus on the 1st year's research outcome and future plans.