Due　to　the　lack　of　detailed　field　data　recording　the　dam　breach　process,　most　of　the　models　for　overtopping-induced　dam　breach　analysis　of　earth-rock　dams　have　not　been　fully　validated.　In　view　of　this　problem,　17　models　for　analysis　of　mechanisms　of　earth-rock　dam　breach　are　summarized.　The　BREACH　model,　DB　model,　and　IWHR　model　were　used　to　simulate　1/3　of　the　accidents　involving　the　Tangjiashan　barrier　dam　breach,　and　the　differences　between　measured　and　calculated　results　regarding　the　erosion　rate　of　dam　materials,　discharge　curve,　and　water　level　curve　were　analyzed.　The　influences　of　cohesion,　the　internal　frictional　angle,　the　non-uniformity　coefficient,　and　porosity　of　dam　materials　on　the　discharge　curve　were　studied　with　the　BREACH　model.　The　results　show　that　the　peak　discharge　predicted　by　the　IWHR　model　is　the　highest,　followed　by　those　predicted　by　the　BREACH　model　and　DB　model;　the　time,　corresponding　to　the　peak　discharge,　obtained　by　the　DB　model　and　IWHR　model,　is　earlier　than　that　obtained　by　measurement,　while　the　corresponding　time　obtained　by　the　BREACH　model　is　later　than　that　obtained　by　measurement;　with　the　increase　of　cohesion　and　the　internal　frictional　angle,　the　calculated　peak　discharge　decreases　and　the　corresponding　time　is　delayed;　with　the　increase　of　porosity　and　the　non-uniformity　coefficient,　the　peak　discharge　increases　and　the　corresponding　time　comes　earlier;　and　the　non-uniformity　coefficient　and　porosity　have　a　significant　influence　on　the　calculated　results　regarding　the　dam　breach.　©　2016,　Editorial　Board　of　Journal　of　Hohai　University　(Nature　Sciences).　All　right　reserved.