Abstract: The elemental composition, properties and main uses of the wollastonite short fiber were described. The wollastonite short fiber-fiberglass-epoxy resin-EMI-2.4 composite was studied. Slenderness ratio, particle size, content and surface-treatment of the wollas-tonite short fiber were discussed. The experiments showed that the wollastonite short fiber is a kind of inorg anic filler with good reinforce and insulation, particularly, the reinforce is very remarkable in the direction of veritcal fiberg lass. The dehiscence of the enwound product was avoided. Because the wollastonite short fiber regulated the viscosity of the epoxy resin under the room temperature, it would be avoided that the epoxy resin was thrown when the fiber glass was enwound. The distribution of the wollast onite short fiber in the system was obser ved by means of SEM and a reinforce model of the inorganic short fiber was advanced.