W-based　alloys　prepared　via　oxide　dispersion　strengthening　have　shown　enhanced　mechanical　performance　in　previous　studies.　In　this　paper,　multi-doped　W　alloys　with　composition　of　W-xAl-0.5Y2O3　(x　=　0,　0.1,　0.5,　0.9　wt.　%)　were　fabricated　via　ball　milling　and　spark　plasma　sintering　(SPS),　and　effects　of　Al　addition　on　microstructure　and　mechanical　properties　were　investigated.　Types　of　particles　in　W-xAl-0.5Y2O3　alloys　were　identified　using　the　electron　probe　microanalysis　(EPMA)　and　transmission　electron　microscopy　(TEM),　which　was　closely　related　with　the　ratio　of　Y:Al.　Complex　Y3Al5O12　particles　were　observed　in　all　the　multi-doped　W　alloys　with　addition　of　Al　due　to　the　reaction　of　3Y2O3　+　5Al2O3　-＞　2Y3Al5O12　at　the　sintering　temperature　of　1600　degrees　C　during　SPS　process.　The　atomic　ratio　of　Y:Al　in　W-0.1Al-0.5Y2O3　was　larger　than　the　stoichiometric　ratio　of　Y:Al　in　Y3Al5O12,　leading　to　remaining　Y2O3.　However,　the　ratio　of　Y:Al　was　less　than　the　stoichiometric　ratio　of　3:5　in　both　W0.5Al-0.5Y2O3　and　W-0.9Al-0.5Y2O3,　where　the　particles　of　Al2O3　were　identified　consequently.　Among　these　alloys,　W-0.5Al-0.5Y2O3　exhibited　the　most　refined　microstructure　with　a　uniform　distribution　of　smaller　dispersion　particles,　leading　to　the　superior　mechanical　strength　and　ductility.