Preparation of composites of spherical reactive polyimide particles (about 3 mu m) with an amino group and a spherical porous silica gel (about 50 mu m) was investigated by dry impact blending. The composite particles obtained consisted of spherical porous silica gel particles (host particles) covered by a film flat, reactive polyimide particles (guest particles). It was confirmed that the composite particles retained the original form, porosity, and handling of the host particles. In addition, the amino group of the guest particles covering the surface of the composite particles was reactive toward acid chloride.