将激光诱导等离子体光谱技术(LIBS)用于钢液在线定量分析，由于基体效应严重影响其精确度，因此在定量分析中应尽量降低基体效应对待测元素的影响。内标法是LIBS定量分析最常见的方法，该方法可以部分消除测量过程中基体效应的影响，但只适用于样本组成简单的情形，对于多元素待测样本中的基体效应无法有效校正，采用一般基体校正法无法实现钢液的实时在线定量分析，后续数据处理工作量较大，不适宜应用于现场。为此提出运用改进线性回归方程的基体校正法再结合Mathematica简短的计算程序，能有效对LIBS钢液在线定量分析进行基体校正，并且通过实验验证了此方法的可行性。

For the laser-induced breakdown spectroscopy (LIBS) for steel liquid online quantitative analysis, due to the influence of matrix effect, the precision is seriously affected, therefore in the quantitative analysis we should try to reduce the influence of the matrix effect on the elements under tests. Internal standard method is the most common method of LIBS quantitative analysis. This method can partially eliminate the matrix effect in measurement process, but it can only be applied to samples with a simple elemental composition, and for complex samples it cannot effectively correct the matrix effect. By adopting the general matrix correction method, real-time online quantitative analysis of molten steel cannot be realized and the following data processing will be difficult, so this method is not suitable for field tests. We use the improved linear regression equation in the matrix correction method in combination with the Mathematica brief calculation program. It can effectively work for the matrix correction of LIBS steel liquid online quantitative analysis. Experiment verifies the feasibility of this method.