本文采用二维层析摄影技术研究了ＨＬ－１装置几种锯齿崩溃的机制。在高密度欧姆放电中，观测到在类锯齿崩溃时，对流泡对中心热心的挤压。在纯欧姆放电中，观测到长达４４ｍｓ的大锯齿，在崩溃时出现了强的对流和冷泡对等离子体柱的扰动，并可能发生与其它磁流体不稳定模式的耦合作用。在微波反锯齿振荡和相对应的软Ｘ射线反锯齿振荡的研究中，观察到了软Ｘ射线辐射截面从一个圆变成一个椭圆的现象 In this paper, two-dimensional tomography was used to study the mechanism of several serrated collapse in HL-1 devices. In high-density ohmic discharges, it was observed that there was a zealous squeeze on the center of the bubble when the serrated teeth collapsed. In pure ohmic discharges, large saw teeth of up to 44 ms were observed, where strong convection and bubbling perturbed the plasma column during collapse and the coupling with other magneto-hydrodynamic instabilities could occur. In the study of microwave anti-aliasing and the corresponding soft X-ray anti-aliasing oscillation, the phenomenon that the soft X-ray radiation cross-section changed from a circle to an ellipse was observed