In this study, various morphological features of plasma were studied by using the visual observation during fiber laser-TIG arc hybrid welding. The results show that based on the non-uniform distribution of light intensity of plasma, approximately 3-4 images of plasma can be obtained simultaneously by using the multi-imaging method and the metal and arc plasma can be distinguished. Compared with the Ar shielding gas, the metal and arc plasma can be distinguished more easily under the He atmosphere. Under the same arc current and imaging conditions, the area of the hybrid welding plasma is obviously larger than that of the single arc plasma, and the area of the plasma in hybrid welding with an TIG arc-laser mode is obviously larger than that of the plasma in hybrid welding with a laser-TIG arc mode. Further analysis shows that the metal vapor and shielding gas are not fully mixed during the hybrid welding. In addition, metal plasma significantly affect the morphology and stability of the hybrid-welding plasma.