In　recent　years,　with　the　popularity　of　Bitcoin　and　other　cryptocurrencies,　the　blockchain　technology　behind　it　has　gradually　become　a　research　focus.　After　the　official　launch　of　Facebook＇s　cryptocurrency　project　Libra　and　the　publication　of　the　Libra　white　paper,　Libra　triggered　extensive　discussions　around　the　world.　Libra　has　aroused　the　public＇s　awareness　of　open　finance　and　is　deeply　impacting　the　traditional　financial　system.　In　this　paper,　we　systematically　review　and　discuss　the　blockchain　technology　and　summarize　Libra＇s　innovations　in　consensus　algorithm,　performance,　and　application　scenario　through　a　comparative　analysis　of　Libra,　Bitcoin,　and　Ethereum.　Finally,　we　put　forward　the　challenges　that　Libra　will　face　in　the　future.