The flow regime of continuous phase and disperse phase and the forces acting on droplets of disperse phase in membrane emulsification were analyzed. It showed that the flow regime and the forces were closely related to each other. Calculation indicated that the interfacial tension force

static pressure force

viscous drag force and dynamic lift force were the main forces acting on the droplets. The formation process of the droplet was studied . The effects of wall shear stress and trans-membrane pressure on disperse phase permeation flux and mean droplet diameter were investigated by experiments. On the basis of calculation and experiments

the influence of fluid flow on membrane emulsification results was discussed.