This paper introduces a method for preparation of single or double encapsulated droplet by using an assembled microfluidic system.In the micro system,a three-way joint is used to form Tshape microfluidic channel,which makes the dispersed phase fissure to form a uniform micro droplets due to the strong shear stress and pressure difference between dispersed phase and continuous phase.On the basis of single droplet preparation,connecting two three-way joints with glass capillary tube,double encapsulated drople...