Among　various　biomass,　algae　have　unique　advantages　such　as　fast　growing,　high　efficient　photosynthesis,　no　competition　with　crops　etc.　Supercritical　Water　Gasification　(SCWG)　is　a　potential　technology　for　converting　algae　biomass　into　gases　(including　H-2,　CH4,　CO,　CO2),　with　merits　with　higher　gas　yield　and　lower　tar　and　char　etc.　A　review　of　the　catalytic　gasification　of　different　algae　in　Supercritical　Water　(SCW)　is　presented　here,　summarizing　the　past　research　about　the　gas　yield　and　distribution　in　production　and　their　corresponding　conditions　and　valuable　conclusions　for　various　algae.　Finally,　based　on　the　literatures　above-mentioned,　future　directions　in　this　field　are　suggested.