提出了一种用光谱层析技术结合数值计算原理来重建等离子束射流温度、密度、压力和速度场的诊断方法．用CCD扫描光谱系统获得谱线强度，通过相对强度法重建温度场；再借助等离子射流有关物理方程来重建其它物理参量．分析了等离子束射流温度、密度、压力和速度场的空间分布特点以及它们之间的内在联系．

By means of using the spectrum tomography combining with the principle of numerical calculation,reconstruction of plasma flow temperature,density,pressure and velocity fields were proposed. Intensity of spectrum line was collected by CCD scanning system of fiber probe. Then,according to relative intensity method,the temperature field was obtained. Using plasma flow physical equations,other parameter fields were gotten. The spatial distribution characteristics of plasma flow temperature,density,pressure velocity field and intrinsic relation of them were completely analyzed.