Abstract:The author puts forward the layer-by-layer inversion method for one-dimensional wave problem,which is based on the gradient regula-rization (GR)method for wave equation inversion,According to wave character,a large problem can be divided into several subproblems solved respectively so that one-dimensional wave inversion problem can be solved on a personal eomputer,The essential principle and algorithm are expounded,and some numerical examples given.Compared with nonlayered inversion method,this method offers equal accuracy,but takes much Iess computer time,The author also lists some troubles incurred due to layer-by-layer calculation,and recommends some measures to cope with the troubles.