Droplet　microfluidics　has　received　increasing　attention　over　the　past　decade.　This　study　proposes　an　easy　method　for　droplet　generation　in　microchannels　by　inserting　a　glass　capillary　into　a　microfluidic　chip　at　required　positions.　The　influences　of　the　capillary　insertion　depth　(0,　60,　and　120　μm),　capillary　inner　diameter　(50,　75,　and　100　μm),　and　two-phase　flow　rate　ratios　(2-12)　on　the　generated　droplet　length　were　investigated.　The　evolution　of　the　two-phase　interface　during　droplet　formation　is　observed　in　detail,　which　undergoes　three　successive　stages:　head　formation,　head　filling,　and　neck　breakage.　Three　neck　breakage　modes　were　identified　as　the　squeezing,　transition,　and　dripping　modes,　and　the　forces　acting　on　the　droplets　were　analyzed.　The　results　show　that　the　proposed　capillary-based　method　can　facilitate　the　generation　of　droplets　in　fabricated　microfluidic　chips　over　a　wide　range　of　two-phase　flow　rate　ratios.　©　2024　American　Chemical　Society.