The　stability　problem　caused　by　the　interaction　between　traditional　doubly　fed　induction　generator　(DFIG)　and　the　power　grid　under　the　condition　of　weak　power　grid　is　prominent.　DFIG　based　on　virtual　synchronous　control　can　provide　support　for　power　grid　frequency　and　significantly　improve　grid-connected　stability.　This　paper　presents　a　method　of　sequence　impedance　modeling　for　DFIG　based　virtual　synchronous　control.　Firstly,　the　impedance　model　of　DFIG　based　virtual　synchronous　control　with　power　outer　ring　is　derived　by　using　the　method　of　harmonic　linearization.　Secondly,　the　output　impedance　characteristics　of　DFIG　based　virtual　synchronous　control　are　obtained　and　compared　and　verified　by　frequency　scanning　method　based　on　the　model.　Finally,　the　effects　of　different　parameters　on　the　output　impedance　characteristics　are　analyzed.　©　2020　IEEE.