Abstract: The new tetracorals discribed in this paper were collected from the Middle Carboniferous Weining formation in Longhuo of Longlin county, Northwest Guangxi. They contain 4 new genera and 14 new species, among which Arachnastraea longhuoensis（sp. nov.） appearance in the lower part of Fusulinella-Fusulina zone, Grootia longhuoensis （gen. et sp. nov.）,Lomaphyliurn magnum （sp. npv.）, Huanglongophyllum parasimplex （sp. nov.）, Yanophyllum crassothecum （gen. et sp. nov.）,Petalaxis gigantea （sp. nov.）, Beshanophyllum petalaxoidea （sp, nov.）appearance in the upper part of profusulinella zone, and Pseudolytvophyllum guangxiense （sp. nov）, Carinthiaphyllum Inoghuoense （sp. nov.）, Cystolonsdaleia incerta （sp. nov.）, Metalonsdaleia typica（gen.et sp. nov.）, Lithostrotionelia breviseptata（sp. nov.）,Youphyllum typicum （gen. et sp. nov.）, Neokoninckophyilum guangxiense (sp. nov. appearance in the lower part of Profusulinella zone.The description of the new genera is given as follows: Genus Grootia X.Yu （gen.nov.） Type species: Paralithostrotion ceriodium Xu in Jia et al., 1977 Diagnosis: Corallum compound, cerioid.Septa of two orders.Lathlike columella developed.Dissepimentarium narrow.Cystosepiments absent.Clinotabulae and tabulae well developed. Remarks: The present genus closely resembles Paralithostrotion Gorsky, but differs from the latter in the cerioid shape of corallites and in the presence of continuous columella.It also shows a similarity to Petalaxis Edwards et Haime em.Sutherland, but in the latter the cystosepiments well developed, the simple axial columella present, and the tabulae are generally horizontal.The diagnosis of new genus is identical with Lithostrotionella（Hillia） Groot, but the name latter was a junior homonym of Hillia Grote, 1883, a lepidopteran, and therefore Lithostrotionella （Hillia） Groot, 1963 in a invelid name. Distribution: M,Carboniferous; China and Spain. Genus Yanophyllum X.Yu （gen.nov.） Type species: Yanophyllum crassothecum X.Yu （gen. et sp. nov.） Diagnosis: Corallum compound, fasciculate.Septa of two orders.Axial columella simple.Dissepimentarium wide.Cystosepiments poorly developed.Marginal stereozone wide.Clinotabulae and tabulae well developed. Peripheral increase. Remarks: This new genus is similar to Liangshanophyllum Tseng and Akagophyllum Minato et Kato, but differs from the latter is having wide marginal stereozone. Distribution: M.Carboniferous; Guangxi, China. Genus Metalonsdaleia X.Yu （gen.nov.） Type species: Metalonsdaleia typica X.Yu （gen. et sp. nov.） Diagnosis: Corallum compound,fasciculate.Septa of two orders.Lonsdaloid cystosepiments very prominent. Axial columella simple and litter,and sometimes median plate developed only. Boundary between the axial tabellae and the tabulae indistinct in longitudinal section.Tabulae complete and horizontal. Remarks: This new genus resembles Lonsdaleia Mccoy, but differs from the latter in the simple axial columella and in the indistinct boundary between the axial tabellae and the tabulae in longitudinal section. It is also related to Huanglongo phyllum X.Yu, but in the latter the clinotabulae well developed. Distribution: M.Carboniferous; Guangxi, China. Genus Youphyllum X.Yu （gen. nov.） Type species: Youphllum typicum X. Yu （gen. et sp. nov.） Diagnosis: Corallum compound,fasciculate. Septa of two orders. Axial columella simple,and joining only with one protoseptum. Boundary between the axial tabellae and tabulae indistinct in longitudinal section. Lonsdaloid cystosepimentarium well developed. Tabulae convex and ascending towards the central area. Remarks: This new genus closely resembles Pseudodorlodotia Minato, but in the latter the columella is irregular lathlike and not everywhere present, the tabulae subhorizontal. It also shows a close similarity to Pseudoyatsengia Yabe, but in the latter the radial lamelae joining with partial major septa, the median plate lacking, and the tabulae mostly horizontal. Distribution: M. Carboniferous; Guangxi, China.