This　paper　discusses　pressure　variation　on　a　wall　during　the　process　of　liquid　flow　and　droplet　formation　in　a　T-junction　microchannel.　Relevant　pressure　in　the　channel,　deformation　of　the　elastic　wall,　and　responses　of　the　droplet　generation　are　analyzed　using　a　numerical　method.　The　pressure　difference　between　the　continuous　and　dispersed　phases　can　indicate　the　droplet-generation　period.　The　pressure　along　the　channel　of　the　droplet　flow　is　affected　by　the　position　of　droplets,　droplet-generation　period,　and　droplet　escape　from　the　outlet.　The　varying　pressures　along　the　channel　cause　a　nonuniform　deformation　of　the　wall　when　they　are　elastic.　The　deformation　is　a　vibration　and　has　the　same　period　as　the　droplet　generation　arising　from　the　process　of　droplet　formation.