Abstract: An SiO2 support material used in a polyolefin catalyst, which consists of a hollow silica particle having a wall of some thickness and a process to prepare the silica mesoporous material above and the agglomerated hollow silica particulate, comprising the steps of: taking nanometer-sized calcium carbonate as inorganic template, or taking PMMA, PS, PU as organic template, then making silica grow and synthesize on the surface of the template, and obtaining the hollow silica material by removing the template. The above hollow silica can be used as raw material to prepare an agglomerated hollow silica particulate by particle shaping. Such material has a certain specific surface area, a wide pore size distribution and a large pore volume, and a uniform particle size distribution, so it can be used in many applications such as adsorption material, catalyst material, wave-absorbing material, ceramic material, sensitive material, magnetic material and the like, especially widely used in the polyolefin catalyst.