Droplet-based　microfluidics　offers　unique　advantages　to　create　platforms　that　fabricate　functionalized　particles　with　increased　accessibility,robustness,and　simplicity.Herein　we　present　a　three-phase　microfluidic　device　that　can　control　the　flow　pattern　to　directly　generate　either　core-shell　or　hole-shell　microparticles.The　major　benefits　of　this　device　are　the　ease　of　control-ling　the　morphology　of　the　compound　droplets　by　the　flow　rates　and　thus　the　microstructure　of　the　synthesized　microparti-cles.The　transition　between　flow　patterns　enables　the　generation　of　either　core-shell　particles　or　Janus　particles　in　a　single　device.We　further　show　the　versatility　of　the　proposed　device　in　fabrication　of　functionalized　particles:the　hole　size　of　the　hole-shell　microparticle　can　be　fine-tuned　while　its　outer　diameter　is　kept　constant,and　by　adding　Fe3O4　nanoparticles　into　the　photocurable　phase,the　obtained　magnetoresponsive　microparticle　can　move　rotationally　or　translationally　under　an　external　magnetic　field.We　anticipate　that　the　present　method　could　facilitate　the　fabrication　of　the　functional　microparticles　for　diverse　applications.