In order to investigate the pore structure and its influence on the material properties of cement-based piezoelectric ceramic composites, specimens with different ceramic/cement ratio of composite are prepared. The pore structure of composite is obtained by using mercury intrusion porosimetry (MIP). The variety of pore structure is attributed to the chemical reaction at the surface of PZT particles and cement grains, which is different with that of cement paste. And the porosity of composite reduces with the increasing of ceramic/cement ratio. Moreover, the influence of pore structure on the mechanical and dielectric properties of composite are discussed in detail. A monotonic decreasing of material properties of composite with total intruded pore volume is found. © 2008 Elsevier Ltd. All rights reserved.