Abstract: 41 species assigned to 21 genus of plant remains from the Datong Formation in Ningwu Coalfield, Shanxi,are recognized by authors. In this paper,the characteristics and geological age are discussed in detail. The flora is composed mainly of Filicinae and Ginkgophytes;Equisetales and Coniferales occupy the second large member,and Cycadophyta is rarely found. It belongs to "Coniopteris一phoenicopsis" flora well-developed in North China,and could be compared with the floras of the Datong Formation in Datong Coal-field, the Mentougou Group in West-Hills of Beijing, the Yanan Formation in Ordos Basin and the Dameigou Formation in Qinghai. the geological age of this flora may be assigned to Middle Jurassic.