The study of gas-phase reaction dynamics has advanced to four-atom reactions.A combination of a calculation of full dimensional quantum dynamics and an accurate potential energy surface(PES)always shows a detailed mechanism of the experimental result.In general,an exact quantum dynamics simulation needs a PES with spectral accuracy,but the error of the PES is inevitable in practical calculations.In order to getting the response behavior of the dynamics properities for a certain distribance on the PES,quantum dynamics calculations and a 2D model PES are adopted in this work.Not surprisingly,the rate constant is sensitive to the distribance near the reaction barrier and the minimum energy path,but insensitive to the distribance in the other positions.More important and straightforward aspect is restated in this work,in the quantum dynamics simulation,adding an artificially disturbance on an accurate PES will help us to understand a given kind of the reaction deeply,and the accurate PES for a real system is a natural model for chemical reactions.