Some electroconductive element such as Cu, Ni powder and graphite powder(CP) were added to ureaformaldehyde(UF) resin to make 3layers Larix composite plywood with electromagnetic shielding effectiveness (SE). The effects of different electroconductively elements and resin spreading quantity on electromagnetic shield effectiveness and bond strength of Larix composite plywood was investigated. The results showed that all the bond strength (ST) could meet or exceed the national standard. The SE was 0.00 dB with Cu, the SE was 0.00~10.10 dB with Ni and the SE was 528~13.13 dB with CP. All the models of SE and ST were significant. Spreading the electroconductively element could increase the electroconductive network. On the other hand, it had the adverse effect on ST, then it led to the negative effect on electroconductivity of plywood. Hence, the combined influence of these two parts led to the SE.
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