The　current　paper　describes　a　water　environment　monitoring　system,　which　is　focused　on　the　online　monitoring　techniques　of　groundwater　detection,,　data　process　and　transmission,　a　local　experiment　equipment　is　also　developed.　Besides,　an　integrated　study,　in　terms　of　host　computer　of　the　groundwater　monitoring　system,　programmable　logic　controller　(PLC)　control　system　and　sensor　technology　is　carried　out.　Moreover,　the　secondary　data　process　of　automatic　detection　instrumentation　and　display　technology　is　integrated,　as　well　as　the　visualized　data　platform　is　primarily　established.　The　water　environment　monitoring　system　improves　the　standard　of　monitoring　indicators　from　the　surface　water　environment　to　groundwater　environment.　The　detection　interval　of　the　system　is　less　than　3min,　and　the　pollution　forecast　scope　surpasses　16　km(2).　A　high　accuracy　of　the　forecasting　and　risk　analysis　can　be　obtained.