研究了在铝合金表面激光直接标刻DM(Data Matrix)码的识读质量、标刻时间与激光标刻参数之间的关系，并重点分析了激光参数对DM码对比度的影响。结果显示，最优参数域并非简单地分布在一个连通的实邻域之内，而是分布在若干个连通实邻域的并集之中。给出了基于识读质量的激光参数的约束空间，并获取了以识读质量、标刻时间综合最优为目标的激光标刻工艺参数组合。同时分析了优化参数所标刻DM码模块的扫描电镜图和能谱数据，从微观上解释了最优激光参数的分布问题。

The correlation occurring between reading quality or marking time of data matrix (DM) code marked on aluminium alloy and laser marking parameters has been studied, and the influence of laser parameters on DM code contrast is analyzed. The experiment result indicates that the optimal laser parameter domain is not simply distributed within a connected real neighborhood, but distributed in a union set of several connected real neighborhoods. The restricted space of laser parameter based on reading quality of DM code is built, and the laser marking process parameters combination with the goal of comprehensive optimal reading quality and marking time is acquired based on this foundation. Meanwhile, scanning electron microscope images and energy dispersive spectrometer data of DM code marked by the optimal parameter module are analyzed, which can explain the distribution of optimal laser parameters in microcosm.