This　study　developed　a　prediction　system　for　forecasting　consequences　of　accidents　based　on　real-time　meteorological　conditions.　This　system　was　established　by　making　couple　of　atmospheric　numerical　modeling　system,　atmospheric　dispersion　model,　source　emission　calculations　module　and　data　post-processing　module.　It　is　capable　to　predict　concentrations　of　hazardous　gases　and　harm　extents　in　emergency.　This　system　can　provide　decision　makers　with　accurate　and　timely　guidance,　so　as　to　minimize　hazards　to　people　and　the　environment.　©　(2014)　Trans　Tech　Publications,　Switzerland.