Microfluidics are widely used in biomedicine,chemical industry and other fields.The lattice Boltzmann method was used to study the flow characteristics of gas-liquid two phase flow in T-shaped microchannel,and the effects of wall characteristics,gas-liquid velocity and gas-liquid flow rate ratio on the kinematic characteristics of two-phase flow were analyzed.The results show that the larger the wall contact angle is,the easier it is to form bubbles.With the increase of capillary number,the separation point of dispersed phase gradually moves away from the two phase inlet,forming a longer stratified flow,which is not easy to form bubbles.When the gas velocity is large,the position of bubble is far away from the junction of T-shaped microchannels,and the length of stratified flow increases.Under different conditions,the pressure decreases gradually along the microchannel direction,and there is pressure fluctuation in the gas-liquid two phase junction area.The peak value of the velocity along the axis of the microchannel appears lagged,and the fluctuation of microchannel axial velocity increases with the increase of the flow rate ratio.The simulation of gas-liquid two-phase flow with high density ratio can explain the mechanism of macroscopic experimental phenomena more deeply.