Abstract: Cu-C-SnO₂ composite porous materials with different addition contents of SiO₂-B₂O₃-Al₂O₃ scaling powder by mass were prepared by pressureless sintering, the phase composition and physical properties of Cu-C-SnO₂ porous materials were analyzed and tested, and the effects of scaling powder contents on the microstructures and properties of Cu-C-SnO₂ porous composites were investigated. The results show that, the suitable content of scaling powder is conducive to the sintering of Cu-C-SnO₂ mixture powders. When the scaling powder content is not excess 5% by mass, the gas permeability and hardness of the sintered compact decrease with the increase in scaling powder content, but the electroconductibility and sintering shrinkage increase as the scaling powder content increases. Meanwhile, the sintering temperature has little influence on the sintering performance of Cu-C-SnO₂ mixture powders and the properties of sintered compact at the range of 730~770℃.