Investigated insect pest of timbers of Da Xing An Ling forest region by means of sampling inspection. Meanwhile we had researched insects pest situation, regularity occurred and biological nature for fire damaged timbers attacked in the log yard. The results showed that the mainly insect species are small black-marmorated longicorn (Monochamus sutor L). We had eagaged in various small tests of timber preservation such as: underwater storage, brushing, spraying and fumigation. The results showed that the fumigant treatment was successful. By means of medium-sized tests of fumigant treatment many times. We had obtained the ideal fumigant and the amount of treatment as well as period of treatment.

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