Abstract: The sedimental characteristics of Early--Middle Carboniferous from North Qilian Zoulang area, Gansu province and some fossil ferns with reticulate veins found in the sediments were described in details. They were: Linopteris musterii, L. obliqua, L. pseudoneuropteroides sp. nov., L. lanceolatus sp. nov., L. ovalis sp. nov., L. variurn sp. nov., Lonchopteris lanceolatus sp. nov., L. crassinervis sp. nov. and Palaeoweichselia yuanii. The flora which was found in Early-Middle Carboniferous from North Qilian Zoulang area, Gansu province belongs to the Euramerica flora. But some important elements of the flora appeared in China earlier than in Euramerica and Pre-USSR. By the way, the author thinks, Cathaysian flora came from north-west part of China, North Qilian Zoulang area were path of Cathaysian flora.

Key words: Fossil fern, Reticulate veins, Early-Middle Carboniferous, North Qilian Zoulang