Abstract: Some newly discovered postcranial material of Gansus yumenensis are described, adding to our understanding of the skeletal anatomy of this basal ornithurine. Such anatomical features include a laterally exposed sternum with a sickle-shaped keel, the ulnare with small metacarpal incision, complete loss of ungual of the minor digit, and manual phalangeal formula of “2−3−1”, as well as some more detailed features of the leg bones. The new material not only provided additional evidence of interdigital web but also preserved some scale-like skin impressions near the joint between the tibiotarsus and tarsometatarsus. A statistic analysis of the measurements of the sternum and major elements of the leg of Gansus further supports the hypothesis that this bird was a volant and diving bird, similar to that of extant ducks.