Hydrogen-fueled　Wankel　rotary　engine　(HWRE)　as　a　promising　power　device　overcomes　some　of　the　drawbacks　of　the　hydrogen-fueled　reciprocating　engine.　However,　its　elongated　combustion　chamber　makes　it　prone　to　knock,　and　little　research　has　been　done　in　this　area.　Hence,　to　understand　the　knock　characteristics　of　HWRE,　the　present　work　focus　on　parameters　of　HWRE　knock　at　2000r/min,　an　excess　air　ratio　of　1.2　and　an　ignition　timing　of　-7　degrees　CA　ATDC.　The　main　results　are　as　follows:　As　with　knock　intensity,　knock　duration　and　maximum　pressure　rising　rate　also　can　characterize　the　knock　of　HWRE　because　of　the　logarithmic　or　linear　relationship　among　three　parameters.　For　the　knock　intensity,　two　parameters　are　needed　to　precisely　characterize　the　HWRE　knock,　while　only　one　parameter　is　needed　for　the　knock　duration　and　the　maximum　pressure　rising　rate.　Considering　the　computing　cost,　the　maximum　pressure　rising　rate　is　better　than　others.　The　knock　intensity　has　a　significant　influence　on　the　timed　sequence　of　peak　knock　pressure　and　peak　in-cylinder　pressure.　Besides,　the　mechanism　of　backfire　caused　by　the　knock　of　HWRE　is　different　from　that　of　the　hydrogen-fueled　reciprocating　piston　engine,　which　results　from　the　inter-cylinder　flame　leakage.　(C)　2022　Elsevier　Ltd.　All　rights　reserved.