Abstract: The paper presents a foundation parameters identification method under the condition of unknown motion input from the base rock.On the basis of analyzing the motion characteristic of the laminated foundation and using the identification theory of the least-square method,the time domain identification method of the layer foundation parameters is established by solving iteratively the input acceleration value and the layer foundation parameters.In addition,the identification process of the layer foundation parameters is implemented according to test data on the laminated foundation model.The result shows that the method can yields good estimation of the layer foundation parameters.