Four methods used for extracting the genomic DNA of bark beetles, Xyleborus mutilatus (Coleoptera, Scolytidae) were studied in this article. An individual X. mutilatus beetle, a bark beetle leg and the specimen reserved in 75% ethanol were selected as testing sample respectively, the genomic DNA of bark beetle was extracted by using four different methods, including classical phenol/chloroform extracting method, improved cetyltrimethyl ammonium bromide (CTAB) method, the sodium dodecyl sulfate (SDS) method and animal tissue/cell genomic DNA extraction kit (i.e. paramagnetic particle method). The extracted genomic DNA was treated with photometric analysis and COⅠ gene amplification. The results showed that all the four methods can be used for the total DNA extraction. For the specimen soaked in 75% ethanol, these four methods were all applicable, however, only the paramagnetic particle method was suitable for the DNA extraction of the specimen,which had been soaked in 75% ethanol over two years. Furthermore, the paramagnetic particle method was also applicable for the total DNA extraction from microscale tissue. The study provids primary information for further molecular systematic research of bark beetles.