Based on Life Cycle Assessment （LCA）, environmental impacts of oriented strand board （OSB） produced by a Chinese company and a European company were evaluated, respectively. Results showed that the Chinese OSB products consumed more non-renewable energy resources while the European OSB products consumed much cleaner energy resources like natural gases. The CO,2, emissions between the two OSB companies were about the same during production. The environmental potential values for acidification, eutrophication and global warming of the Chinese OSB products were higher than those of the European OSB products, but the Chinese OSB products had less impact on ozone depletion and photochemical smog.