[in Chinese with English abstract: ] The present studies of the genus Circinaria in northern China were based on morphological, chemical and ecological characters. More than 400 specimens collected from eleven provinces in northern China were examined. Twelve species are recognized. Six new combinations in the genus Circinaria are presented. Aspicilia maculata f. subochracea is upgraded to species level. Circinaria hispida and C. schafeevii are new records to China. Lecanora tortuosa var. ferruginea, L. tortuosa var. simplicior and L. tortuosa var. perfecta are synonymized with Circinaria tortuosa. Illustrations and an identification key to the species known in Northern China are provided. Key words: Megasporaceae, Ascomycota, Pertusariales, Lecanoromycetes.