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Li-Mg-Al-Ti-M based lightweight high entropy alloys (lightweight HEAs) were synthesized through mechanical alloying and the possibility of solid solution formation was systematically investigated. The quaternary Li-Mg-Al-Ti system exhibited a HCP structure. Solid solutions were formed in the alloys with V or Nb among the 15 types of LiMgAlTiM alloys. Furthermore, distinct BCC single phase solid solution were successfully synthesized by adjusting the composition of the Li-Mg-Al-Ti-V system. The typical indicators of solid solution formation which have been used in HEAs were applied to this study. As a result, it was found that the effective indicators for mechanical alloying differ from those used in conventional melting methods, meaning their dependency on the alloy fabrication process.