传统计算机语言语法复杂,要求程序员具有较高的编程水平.MATLAB作为一种新兴的计算机语言具有简单易学、代码短小高效、计算功能强大等优点,正日益被广大工程技术及科研人员所接受.介绍了最小二乘法测定点阵参数的数学原理,以及如何利用MATLAB进行编程实现点阵参数的精确测定,并且利用自编的程序测定了贮氢合金LaNi5的点阵参数, 计算结果与现有文献提供数据吻合良好,证明该程序具有较高实用价值.-Traditional computer language syntax complex, requiring the programmer has a high level of programming. MATLAB as a new computer language is simple to learn, the code short and efficient, powerful computing, etc., is increasingly being accepted by the majority of engineering and research personnel. the mathematical theory of least squares method for the determination of the lattice parameter, and how to use MATLAB programming to achieve the accurate determination of the lattice parameter was measured lattice parameters LaNi5 hydrogen storage alloy and use self procedure results with existing literature provide data are in good agreement, to prove that the program has a high practical value.