The　dielectric　recovery　characteristics　are　very　important　for　the　successful　interruption　of　the　vacuum　circuit　breaker.　In　order　to　explore　the　influence　of　the　post-arc　dielectric　recovery　characteristics　of　the　multi-break　vacuum　circuit　breaker　on　its　breaking,　this　article　establishes　a　simulation　model　of　the　multi-break　vacuum　circuit　breaker　and　a　750kV　short　line　fault　simulation　circuit　in　MATLAB.　By　adjusting　the　dielectric　recovery　characteristics　of　different　breaks,　the　critical　dielectric　recovery　rate　(The　minimum　dielectric　recovery　rate　of　the　break　when　the　circuit　breaker　does　not　break　down)　under　different　conditions　is　finally　obtained.　In　addition,　the　influence　of　the　equalizing　capacitor　on　the　critical　recovery　rate　is　also　explored.　It　is　found　that　the　smaller　the　grading　capacitance,　the　greater　the　voltage　of　the　break,　and　the　greater　the　critical　dielectric　recovery　rate.　©　Published　under　licence　by　IOP　Publishing　Ltd.