The non-blocking rupture process of droplets in asymmetric T-type microchannels was studied using a high speed camera. The glycerol-water solution and mineral oil with 4%(mass) surfactant Span-20 were introduced as the dispersed phase and continuous phase

respectively. The breakup process of droplet could be divided into three stages:entering stage

deformation stage and breakup stage. The breakup stage could be further divided into two sub-stages:fast breakup stage and thread breakup stage. The effects of liquid superficial velocity

the dimensionless length of the droplet and the viscosity ratio between dispersed phase and continuous phase on the breakup stage were investigated. The results indicated that the fast breakup stage was a self-similar process

the evolution of the dimensionless minimum width of the droplet neck with the dimensionless remaining time could be scaled by a power-law relationship

and the value of power law index was about 1.35. In the thread breakup stage

the dimensionless minimum width of the droplet neck was linear with the dimensionless remaining time. The slope of line increased with the increase of liquid superficial velocity and the dimensionless droplet length

and reduced with the increase of the viscosity ratio between dispersed phase and continuous phase.