PI solid phase microextraction coating was prepared from pyromellitic acid dianhydride and 4

4′-diamino-diphenylether. PI coating was modified by ethyl silicate and 1

3-bis(3-aminopropy)tetra-methyldisiloxane.Ethyl silicate modified PI coating and silane coupling agent modified PI coating were synthesized.The structure of the coating was characterized by IR.The thermostability of the coating was examined by thermal analysis.The element composition and chemical environment of the coating surface was analyzed by X-ray photoelectron spectroscopy.The effect of surface structure and adsorption performance of the coating was investigated. The benzene adsorption quantity of the silane coupling agent modified PI coating was greater than the ethyl silicate modified PI coating and PI coating.