In order to study the dynamic behavior of non-spherical particles captured by magnetic fibers in the magnetic field, and based on the two kinds of dust, converter ash and refined ash, discharged from the converter and the refining furnace in the steel-making process in the iron and steel industry. The shape factor is calculated by formula, φ=0.21, 0.78, 0.81 and 1.00, respectively expressing the circular shape (thickness H=diameter of the bottom circle d/40), ellipsoid shape (radius of the equator of the x-axis:equator of the y-axis:z-axis polar radius=a:b:c=1:1:4), square shape and spherical particles. Under the same working conditions, the simulation results show that when the shape factor is close, the capture efficiency and moving track has nothing to do with the specific shape characteristics shown by dust particles. During the traditional single fiber capture process, while the inlet velocity v=0.1m/s and d_p>2.0μm, the larger the difference of shape factor is, the larger the difference of capture efficiency will be. The influence of shape factor on particles captured is positively correlated with the increase or decrease of single fiber capture efficiency. In the magnetic field produced by magnetic fiber, while v=0.1m/s and d_p>0.5μm, the larger the difference of shape factor is, the larger the difference of capture efficiency will be. When φ ≥ 0.4, the capture efficiency tends to be stable with the increase of shape factor, and the influence of shape factor on particles captured is not related to the increase or decrease of single fiber capture efficiency. In the high gradient magnetic field, when v=0.1m/s and d_p=1.0μm, a larger difference of shape factor leads to more obvious of a rule in which the difference between capture efficiency is larger. When v=0.1m/s and 0.5μm ≤ d_p ≤ 2.5μm, the influence of shape factor on particles captured is positively related to the increase or decrease of single fiber capture efficiency.