Because　of　stringent　emissions　regulations,　internal　combustion　engines　using　natural　gas　have　become　an　important　direction　for　the　low-carbon　development　of　the　internal　combustion　engine　industry.　The　combustion　process　of　the　internal　combustion　engines　using　natural　gas　involves　the　interaction　between　the　gas　jet　and　the　flame.　In　this　study,　the　process　of　a　methane　jet　impinging　on　a　methane　premixed　ignition　flame　inside　a　constant　volume　bomb　was　simulated　by　CONVERGE　software,　and　the　changes　in　combustion　and　flow　within　the　jet　impinging　flame　flow　field　were　investigated.　A　k-value　was　defined　by　the　ratio　of　jet　velocity　to　laminar　combustion　velocity,　and　k　is　found　to　be　inversely　proportional　to　the　maximum　value　of　the　rate　of　change　of　flame　surface　area　A,　and　k　is　proportional　to　the　peak　value　of　the　rate　of　change　of　turbulent　kinetic　energy.　It　was　also　found　that　the　jet　intensifies　the　initial　premixed　flame　under　three　k-value　operating　conditions,　and　the　OH-based　change　rate　within　the　flow　field　increases　abruptly　by　a　factor　of　4-9　after　the　jet　is　added.　The　process　of　jet　impingement　on　the　flame　is　divided　into　three　stages　according　to　the　mutual　position　of　the　jet　and　the　premixed　flame　surface,　and　the　evolution　of　the　flame　structure　and　the　combustion　behavior　in　the　flow　field　under　different　stages　are　analyzed　in　the　article.　It　was　found　that　the　initial　premixed　flame　induced　by　the　jet　became　unstable　in　the　second　stage　and　a　stable　turbulent　combustion　flame　was　formed　in　the　third　stage.　Analysis　of　the　parameter　changes　at　three　points　on　the　axial　direction　of　the　jet　nozzle　revealed　that　the　jet　disturbance　at　the　near-nozzle　end　was　too　large　to　form　stable　combustion.　Meanwhile,　at　the　far-nozzle　end,　the　jet　disturbance　formed　a　vortex　volume　suitable　for　combustion,　and　turbulent　combustion　was　produced　by　the　heat-induced　by　the　flame　moving　toward　the　unburned　area　and　the　vortex　volume　disturbance.