The ablating model of a bulk target irradiated by a pulse laser is set up.Using the simple energy balance considerations,the relationship of the ablating surface's location with the time is derived.By adiabatic approximation,the continuous-temperature condition and conservation of energy,we find out all the boundary conditions.By using the combination of analytical method and integral-approximation method,and solving the heat flow equation,the temperature distribution of soild and liquid phases' as functions of time and location are obtained,the interface of solid and liquid phase is also derived.In addition,the results are compared with other published data.Finally,most of the calculated results present are on excimer-laser irradiated target Al,although the calculations can be easily extended to laser irradiation of other targets.