根据丰满大坝坝顶水平位移观测资料， 采用逐步回归方法分离出坝顶水平位移水压分量， 以最小二乘目标函数为基础， 建立了正则化最小二乘参数识别方法， 数值计算结果表明， 该参数识别方法对于基于坝顶水平位移识别坝体混凝土的弹性模量和坝基岩石的弹性模量是行之有效的， 并且具有良好的稳定性和较快的收敛速度， 参数识别结果表明大坝混凝土的弹性模量与现场取芯实验结果基本一致． According to the observation data of the horizontal displacement of Fengman Dam, the horizontal displacement hydraulic components are separated by stepwise regression method. Based on the least square objective function, a regularized least square parameter identification method is established. The numerical results show that, The parameter identification method is effective for identifying the dam concrete elastic modulus and the dam-based rock’s elastic modulus based on the horizontal displacement of the dam top, and has good stability and fast convergence rate. The parameter identification results show that the dam The elastic modulus of concrete and the field coring experiment results are basically the same.