The　present　study　aims　to　improve　electrochemical　properties　of　the　La-Mg-Ni-based　hydrogen　storage　alloys　through　partial　substitution　for　La　by　mischmetal　(MM).　The　La0.8-xMMxMg0.2Ni3.1Co0.3Al0.1　(x　=　0,　0.1,　0.2,　0.3)　alloys　were　prepared　by　inductive　melting,　and　their　phase　structures　and　electrochemical　properties　were　studied　by　X-ray　diffraction　(XRD),　scanning　electron　microscope　(SEM),　energy-dispersive　X-ray　spectrometry　(EDX)　and　electrochemical　tests.　Results　show　that　the　alloys　mainly　consist　of　La2Ni7-type　phase,　La5Ni19-type　phase,　LaNi5-type　phase　and　LaNi3-type　phase.　The　addition　of　MM　does　not　change　the　phase　compositions,　while　it　leads　to　more　uniform　phase　distribution　and　obviously　promotes　the　formation　of　La2Ni7-type　phase　which　possesses　favorable　electrochemical　properties.　Electrochemical　studies　indicate　that　the　substitution　for　La　by　MM　could　effectively　improve　the　high　rate　dischargeability　(HRD)　of　the　alloy　electrode,　and　the　optimal　value　of　HRD1500　(HRD　at　1500　mA.g(-1))　increases　from　40.63　%　(x　=　0)　to　60.55　%　(x　=　0.3).　Although　the　activation　properties　of　the　alloy　electrodes　keep　almost　unchanged,　both　the　maximum　discharge　capacity　(C-max)　and　the　cycling　stability　are　significantly　improved　by　MM　addition.