The main assumptions of plasmas diagnosis by optical emission spectroscopy are introduced.The most common methods to determine the value of electron temperature and density are deduced, The research progress of plasmas diagnosis by optical emission spectroscopy is reviewed, which are provided as useful information for full acquaintance, and are also provided as theoretical backup and technologic reference for future experiment work.%综述了激光等离子体发射光谱诊断的基本假设;介绍了电子温度、密度光谱计算最常用的方法;同时综述了国内外激光焊接等离子体光谱诊断的研究进展.旨在对激光焊接等离子体光谱诊断基本理论和当前的研究进展进行全面的梳理,并对开展激光焊接等离子体光谱试验工作提供理论支持和技术参考.
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