An axisymmetric quasi-steady state model of liquid expulsion induced by millisecond pulsed laser is built through the research of heat flux in the liquid ejection.The temp erature of central point,the flow velocity of molten liquid on quasi-steady state of liquid expulsion,the ablati on speed of central point and the molten pool shape are obtained by the analytic and numerical calculation.The des cend velocity of the central point on molten pool obtained from the calculation decreases with the time in mi llisecond pulse duration,and the decreasing rate reduces gradually.The liquid velocity o n molten pool surface in quai-steady state condition increases with the increasing radius of the molten pool,and the increasing rate reduces gradually.The shape of the molten pool after irradiating obtained from the calculation agrees with the experimental result,and then the dependences of temperature on central point and the radius of evaporation area on pulsed laser power density are discussed.With the increasin g power density of millisecond pulsed laser irradiated on the metal sample surface,more and more l aser pulse energy converts into heat of metal target.Then the temperature on central point of molten pool and radius of the evaporating area on liquid surface both increase.