Plasma　actuation　is　a　novel　method　for　axial　compressor　flow　control　with　advantages　of　short　response　time　and　broad　frequency　range.　Numerical　simulation　of　tip　leakage　vortex　control　in　a　low　speed　axial　compressor　with　pulsed　plasma　actuation　is　performed.　Millisecond　pulsed　dielectric　barrier　discharge　plasma　actuation　with　different　frequencies　are　generated　on　the　inner　wall　of　compressor　casing　at　the　rotor　leading　edge.　Scale　adaptive　hybrid　Reynolds-averaged　Navier-Stokes/large　eddy　simulation　method　based　on　shear　stress　transport　turbulence　model　is　adopted.　The　plasma　actuation　is　simplified　as　a　body　force　in　the　simulation.　Results　show　that　the　frequency　has　a　strong　influence　on　the　control　effect　of　pulsed　plasma　actuation.　Pulsed　plasma　actuation　with　frequency　of　0.25　blade　passing　frequency　(BPF),　0.5　BPF　and　1.0　BPF　extend　the　compressor＇s　stability　range　effectively.　The　mechanism　is　tip　leakage　vortex　oscillation　in　the　stream　wise　direction　through　coupling　between　unsteady　plasma　actuation　and　tip　leakage　flow.　However,　pulsed　plasma　actuation　with　frequency　of　0.125　BPF,　2　BPF　and　3　BPF　fails　to　improve　the　stability　range.　The　mechanism　of　pulsed　plasma　actuation　at　2　BPF　and　3　BPF　is　similar　to　that　with　steady　plasma　actuation,　which　is　only　stream　wise　boundary　layer　acceleration.　The　oscillation　of　tip　leakage　vortex　in　the　stream　wise　direction　can＇t　occur.　For　the　pulsed　plasma　actuation　at　0.125　BPF,　its　frequency　is　too　low　to　get　enough　control　effect.