With　the　acceleration　of　tunnel　construction,　emerging　issue　of　high-pressure　karst　water　burst　becomes　more　and　more　complex,　and　the　study　subject　of　analyzing　and　grasping　its　features　and　taking　effective　risk　control　measures　is　still　a　world-class　long-standing　puzzle.　Based　on　the　feature　analysis　of　the　karst　water　burst　disaster　during　the　construction　of　karst　tunnels　at　home　and　abroad,　the　special　water　burst　accompanied　with　high　pressure　water　burst,　earth　burst　and　rock　burst　is　defined　as　super　karst　water　burst.　With　the　analysis　of　super　karst　water　burst　which　happened　in　Maluqing　Tunnel　of　Yi-Wan　Railway,　five　basic　characteristics　of　super　karst　water　burst　are　obtained,　and　its　risk　sources　are　also　identified　from　the　respects　both　of　geology　and　human　engineering　activities.　Based　on　the　theoretical　analysis,　numerical　simulation　and　on-site　engineering　experience,　several　threshold　conditions　for　the　occurrence　of　super　karst　water　are　identified.　In　response　to　implementation　plan　of　risk　identification,　the　method　of　advanced　horizontal　drilling　with　drainage　test　and　closed　water　test　is　also　proposed.