Abstract: OBJECTIVE　To establish the GC identification method of guaiacol in the Shukang adhesive plasters. METHODS The method was applied to identify guaiacol in the extractum kernel crataegi by GC. A column (30 m×0.25 mm, 0.25 μm) packed with 5% phenyl 95% methyl polysiloxane as the liquid phase on the solid support. The column temperature is set at 50 ℃ and hold for 5 min for injection, then programmed at 10 ℃·min^-1 to 220 ℃; splitless injection. RESULTS　Guaiacol in the extractum kernel crataegi could be identified by GC. CONCLUSION　The GC methods are simple and reproducible, and can be used for the identification of the plasters.