Junction　point　pressure　changes　during　droplet　formation　in　Y-junction　microchannels　with　differed　Y-angles,　wetting　property　and　capillary　number　of　the　liquid　by　using　a　three　dimensional　numerical　simulation.　The　pressure　of　the　junction　point　fluctuates　throughout　the　droplet　formation　process,　and　it　can　be　used　to　depict　exactly　and　directly　different　stages　of　droplet　in　microchannels.　And　the　pressure　of　junctions　with　different　Y-angles　of　microchannel,　different　contact　angles　of　dispersed　phase　with　the　surface,　and　different　capillary　numbers　of　continuous　phase　could　thus　be　investigated　via　the　droplet　formation　mechanism.