Abstract: The Niutitang Biota from the lower Cambrian in Songlin Town，Zunyi County，Guizhou Province，southwestern China is dominated by sponges and represents early radiation of sponges in early Cambrian．Two common sponge genera were found in the lower horizon of the Niutitang Boita．They are Triticispongia(Mehl et Reinter)，1993 and Saetaspongia(Mehl et Reinter)．1993．Body wall of the former is composed of two kinds of stauractin of different sizes．which are mainly in diagonal arrangement．The body wal1 of the latter is composed of dense accumu1ations of hairlike diactines．Spicules in these two genera do not protrude out of body wal1．Sponge body of both genera hardly exceeds 10 cm in size．They belong to Hexactinellida．Both genera were firstly found in black shale of the lower part of the Niutitang Formation，Sancha Town，Dayong，Hunan Province，and then in the Niutitang Form ation in Zunyi，Guizhou Province．