Abstract:Complicated linear equation system for solving 3-D wave equation can be changed into 3 simple linear equation systems by using basic property of wave eqtiation under the same condition as in usual finite element methods. In other words,the coupled equations are simplified to low-order equations which are equivalent to those in 1-D condition. This method brings the same accuracy as ordinary finite element methods but takes much less internal storage and computation than they.In the one-dimensionized method,we can make high-order interpolation instead of sectionalized linear interpolation,and take different interpolation times in the different directions of computation domain.