Feathers, as the most intricate integumentary appendages, exhibit remarkable morphological diversity and serve various functions in both birds and non-avian dinosaurs. The presence of feather fossils plays a pivotal role in elucidating the evolutionary history of feather in early birds or non-avian dinosaurs. This study presents an account of a feather fossil discovered in the Lower Cretaceous of the Yumen region in Gansu Province, which is identified as a body feather due to its semi-open closed pennaceous structure and elongated rachis, with the presence of the afterfeather. This intricate feather likely originated from Early Cretaceous enantiornithine inhabiting the Yumen area. By comparing the vane length of this body feather with that of modern birds alongside assessing the afterfeather length, it can be inferred that the owner has a small body size. Furthermore, the discovery of this fossil indicates that in the Early Cretaceous, some birds had developed the afterfeather structure as an adaptation to diverse environmental conditions.