The sensory receptors of antenna in female Diglyphus isaea Walker were studied with scanning electron microscopy to identify their sensillar structure and their possible functions in the host selection process. Eight distinct types of sensory receptors were found on antenna, including Bohm's   bristles, sensory pore, uniporous trichoid sensilla, multiporous plate sensilla, basiconic capitate sensilla, thick-walled chemoreceptor, thin-walled chemoreceptor, trichoid sensilla. Functions of these sensilla were analyzed and discussed in detail.