The　decomposition　and　identification　of　signals　are　crucial　for　flow　vector　acquisition　in　a　multi-dimensional　measurement.Here,we　proposed　a　two-dimensional(2D)flow　vector　measurement　system　based　on　all-fiber　laser　feedback　frequency-shifted　multiplexing　technology.The　reliable　performance　of　the　system　is　characterized　by　experimental　verification　and　numerical　simulation.An　orthogonal　dual-beam　structure　is　employed　to　eliminate　the　impact　of　an　unknown　incident　angle　in　the　practical　application.Meanwhile,the　vector　velocity　signals　in　2D　can　be　decomposed　into　one-dimensional(1D)scalar　signals　by　adopting　the　frequency-shifted　multiplexing,which　makes　it　easy　to　obtain　the　vector　information　and　velocity　distribution　of　fluid　motion　through　the　self-mixing　interference　frequency　spectrum.Moreover,the　measured　flow　rates　present　a　high　linearity　with　syringe　pump　speeds　ranging　from　200　to　2000　μL/min,and　the　velocity　information　of　the　different　incidence　angles　is　easily　obtained　with　high　precision.This　work　may　pave　the　way　for　the　acquisition　and　processing　of　multi-dimensional　flow　vector　signals,with　potential　applications　in　biomedical　monitoring　and　microflow　veloc-ity　sensing.