Deep-sea mining may have adverse effects on the environment. It is of increasing concern in the formulation of development regulations, especially the plume flow caused by mining, whose environmental impact threshold may overturn the existing mining processes. The current research methods for deep-sea mining plumes mainly include indoor experiments, model calculations, and on-site monitoring. The spatial scale differences between experiments and analytical calculations are significant, and the monitoring range and time are limited. The reliability and accuracy of the results still need to be analyzed. The existing experimental results are compared with numerical simulations and monitoring data. The plume migration and diffusion are analyzed from the model principles, calculation boundary conditions and sediment characteristics, and the environment impact threshold is discussed. It can provide references for the subsequent analysis of the deep-sea mining plume.