In　the　natural　geological　environment,　there　are　many　joints,　faults　and　cavities.　These　natural　defects　will　have　an　impact　on　the　stability　of　tunnels.　This　paper　investigates　different　conditions　of　surrounding　rock:　intact　surrounding　rock,　surrounding　rock　with　open-flaw　and　surrounding　rock　with　filled-flaw　under　the　true　triaxial　test.　The　effect　of　different　surrounding　rock　conditions　on　the　internal　failure　characteristics　of　tunnel　under　true　triaxial　conditions　is　explored.　According　to　the　characteristics　of　energy　evolution　and　chaos　theory,　the　failure　characteristics　inside　the　tunnel　is　divided　into　stages.　The　results　show　that:　1)　The　failure　characteristics　in　the　tunnel　are　different　for　different　surrounding　rock　conditions.　The　failure　characteristics　do　not　represent　the　stability　of　the　surrounding　rock　of　the　tunnel;　2)　The　trend　of　energy　dissipation　is　different　under　different　surrounding　rock　conditions.　The　elastic　stage　of　the　surrounding　rock　is　shortened　and　the　dissipation　energy　shows　an　earlier　upward　trend　as　its　integrity　declines.　3)　When　analysing　the　tunnel,　chaos　theory　can　give　early　warnings　about　the　instability　of　the　surrounding　rock,　but　it　can　not　give　early　warning　of　particle　spray　and　spalling　inside　the　tunnel.