The interaction of an impinging jet in laser drilling is carried out using an explicit, coupled solution algorithm with solution-based mesh adaptation. The essential process of gas jet-workpiece interaction can be described through the description of axisymmetrical impinging jet. It is completely shown that there are two states including contact and separation between the incident shock and the normal shock in gas jet-workpiece interaction. At the same time, this paper shows the reason for the existence of the second reasonable ranges of laser cutting. The effect of processing parameter on dynamic characteristic is analyzed, and this paper also analyzes the relationship between machining capacity of assist gas and standoff distance. The mass flow rate decreases rapidly with the increase of standoff distance before the end of direct interaction between the incident shock and the normal shock, so the standoff distance should be set in reasonable ranges.