The albitite dispdrsed over the Qinshan-Zhulinguan area consists of a series of small intrusive and metasomatic bodies disintegrated from the “Jiuliping Formation” which is sandwiched between Zhuling-Qinshan fault and Shanyang –Doufujian fault in the East Qinling orogenic belt. Comprehensive studies show that the albitite was formed by intrusive-metasomatic activity of alkali fluids (a kind of special magma or solution).Rocks of the albitite can be mainly divied into three types ,viz.,lumpy albitite,breccia of albitite and brecciated albitite.Among them ,the first type was formed by intrusion and the last two types were formed by cryptoexplosion and filling-metasomatism..Both the lumpy albitite and the brecciated albitite have the same Rb –Sr isochron age of 364.9±10.9 Ma, indicating that the activity of the alkali fluids occurred in Devonian.