针对激光三角法输入输出关系在大位移小夹角测量中非线性太强的缺点，改进标定方法以提高系统稳定性和测量精度。根据本文的实际情况，从基本的像点 -位移曲线关系出发，对公式进行了化简。结合非线性回归分析和逐段逼近的方法，提出新的标定方法。通过非线性回归保证标定的精度和稳定性，逐段逼近对系统误差自动校正。最后进行了大量实验，数据表明该标定方法具有良好的稳定性和较高的精度。该方法采样数据较少，精度高，对系统误差有一定的自动校正能力，特别适合于对大位移测量系统进行快速标定和系统误差校正。

An improved calibration method were proposed to avoid the shortcoming that it has a huge nonlinear relationship between system input and output when using laser triangulation under large range small anger circumstance. Comparison among several typical calibration methods was firstly presented, by which the advantages and disadvantages of each method were considered. A compound calibration method which has the potential of high precision and stability were then proposed. A displacement measuring system was completed based on this method, which was examined by experiments to have obvious superiority over those systems based on typical method when used in huge arrangement measuring.