The　fault　ride-through　(FRT)　capacity　has　become　an　important　grid　requirement　for　fractional　frequency　offshore　wind　power　system　(FFOWPS)　based　on　modular　multilevel　matrix　converter　(M3C).　In　this　paper,　a　novel　joint　fault　ride-through　strategy　is　proposed,　which　employs　a　land　grid　voltage　versus　offshore　grid　frequency　droop　control　on　M3C.　Then,　the　control　system　of　wind　turbines　can　adjust　the　generated　active　power　from　wind　based　on　the　offshore　grid　frequency.　Different　form　the　previous　research,　the　proposed　joint　control　method　can　maintain　the　stability　of　the　M3C　DC　capacitor　voltage　under　the　premise　of　satisfying　the　reactive　power　support　to　the　grid　under　fault　condition.　Simulation　results　validate　the　fault　ride-through　capability　of　the　FFOWPS　in　MATLAB/Simulink.　©　2019　IEEE.