Abstract: A new osteolepidid crossopterigian, Thursius wudingenszs sp. nov., is described from the middle Devonian Haikou formation, Wuding, Yunnan, China. This is the first description of osteolepidid fish from China. The fossil materials were discovered in the quarry of Wuding cement factory in early 1960's. Several Placoderm forms from the same site were identified by Zhang Guorui (1965, 1980) as Dianolepis, Xichonolepis, and Bozhriolepis. Recently, more materials have been collected from the site. These and those collected years ago include most parts of the head of an osteolepidid fish. Since they are all cosmine covered, have the same color, similar thickness and size, it is natural to consider them as belonging to the same form. With reference to the description and plates of Scotland osteolepidid fish (Jarvik, 1948), these disarticulate dermal bones are recognized and reconstructed as an almost complete head. And a new species is set.