not in Young Aleiodes esenbeckii (Hartig) is a dominant natural enemy parasiting on Dendrolimus spp. in forests . Scanning electron microscopy was used to observe the morphology and ultrastructure of sensilla on antenna, maxillary palpus, tibia of fore leg and ovipositor of A. esenbeckii. Generally, A. esenbeckii have 5 types of sensilla, namely, sensillum placodeum, sensillum trichoideum, sensillum chaeticum, sensillum campaniformium and sensillum basiconicum. The adaptive implications of the morphology and distribution of these sensillum of A. esenbeckii are discussed. Aleiodes esenbeckii (Braconidae). Aleiodes esenbeckii: Antennae, Maxillae, Maxillary palps, Thoracic legs, Foreleg tibia, Chemoreception, Chemosensitive sensilla morphology and ultrastructure, Proprioceptors, Campaniform sensillae morphology and ultrastructure, Ovipositor. Arthropods; Hymenopterans; Insects; Invertebrates. none