The greenschists are of wide distribution in metamorphic series of Jianzhen Group, Northern Fujian, which range from several to decades of meters thick, partially up to hundreds meters. As a result of regional metamorphism the rocks were metamorphosed to assemblages of greenschists and lower amphiboIite facies and appeared usually in masive, banded or schistose structures. These rocks are composed mainly of actinolite, epidote, chlorite, albite (plagioclase)，and minor amphibole, diopside, garnetand forsterite. from the characters of mineral association, relict texture andstructure, accessary menerals, petrochemitry and their field occurence the ori-ginal rocks of these greenschists were defined as med-basic volcanic rocks, med-basic intrusions, layered tuffs, argillaceous carbonatite and"Skarn-Like" rocks. The med-basic volvanic rocks including spilite (Na20/Qa.O> 0.4) and basalt (Na2O/Ca0<0 .4) are characterized by relict volcanic texture and contain more than 40% albite (plagioclase).The accessary minerals are presented as euhedral, of those the agatites have length; width ratio of 3:1. Med-basic intrutions are composed mainly of amphiboles and plagioclases, which characterized by blastoprismatic texture with coarse grains. Layerred tuffs appear in a stable occurence and contain both the volcanic and sedimentary elastic meterial. The accessary minerals are various in kind and all have an irregilar form. From analysis the rocks contain 1.5-2 % Na2O, 1-2 % TiO2 and 10-20 % CaO. Argillaceous carbonatites, remaining no original texture, are composed mainly of actinolite, epiolote and chlorite, and usually lack of plagioclese. The rocks have Ca0+Mg0 content of 25-30%, Na2O and TiO2 less than 1%and 0.5 % respectively. The "skarn-like" rocks remaining no orginal texture are composed mainly of coarse epidote, diopsite and garnet. The rocks have Mg0+CaO content more than 25% and 1-2% Ti02.