This paper used fourth-order difference operator in computational domain

and staggered grid calculation method in perfectly matched layer（PML） to simulate forward wave field

in order to suppress dispersion and reduce the boundary reflection by upgrading difference accuracy.Waveform informations for the Ricker aren’t obvious

this paper conducted a source simulation method

and achieved ideal waveform record based on the Marmousi model.Simulation example results show that the algorithm can effectively improve the dispersion and boundary reflection phenomenon

especially in the high frequency case

the algorithm can obtain satisfactory results.