The　paper　aims　to　introduce　the　accident　influence　predicting　method　of　hazard　sources　based　on　real-time　meteorological　information.　This　method　is　integrated　by　the　atmospheric　numerical　modeling　technique,　the　simulation　method　of　atmospheric　dispersion,　the　source　emission　calculations　method　and　the　data　post-processing　technique.　This　method　can　predict　the　concentration　of　hazardous　gases　caused　by　emergency　in　3-dimensional　space,　and　evaluate　harm　extent　of　the　accident　using　concentration　limits　of　each　pollutant.