Abstract：The finite differencl algorithm is usually used in forward modeling of wave equation,and its cal-culating precision depends on used discrete grid and differential order.Using regular grid for dis-cretization results in diffraction noise for dip inter-face,and infilling grid may increase the computing efforts.For that reason,the paper presented a dif-ferential forward modeling method by using irregu-lar grid and having any order precision,which can basically eliminate discrete diffraction noise and improve forward modeling precision in a precondi-tion of slightly increasing computing efforts.The tests of two models showed that the method can better overcome discrete diffraction noise resulted from numeric discretization on dip interface and is an effective and practical method for increasing for-ward modeling precision in complicated geological model.
