The invention relates to a component of a matching filter. The filter is an umbrella vena cava filter comprising leg portions and a neck portion; components are made of threadlike shape memory material; the component comprises a diversion structure which is approximately in a conical spiral line shape and whose minimum and maximum spiral diameters are slightly larger than the diameter of the filter with which they are assembled, respectively. The purpose of the invention is to accelerate the dissolution rate of captured thrombus, in particular to reduce the dissolution period of large thrombus, so as to prevent the normal recovery of filter when the thrombus is not dissolved. At the same time, the support force of the legs of the umbrella filter can be improved and the displacement of filter can be prevented. The invention also discloses a preparation method of the component, shaping device and a loading method.