Abstract: As the smallest density metal structure material, Mg-Li alloys have advantages of high specific strength and specific stiffness, excellent damping performance and electromagnetic shielding performance, but the low absolute strength greatly limits their wide application in practical engineering. The research status on strengthening methods of Mg-Li alloys such as alloying strengthening, deformation processing strengthening, heat treatment strengthening and composite strengthening in recent years are summarized. The future research direction of strengthening methods of Mg-Li alloys is prospected.