Epidotes are extensively seen in various metamorphic rocks of the Bikou Group, especially in such metabasites as greenschist and blueschist. X(ps) values of epidotes from greenschist are in the range of 0.23--0.37, mostly 0.30-0.32.Epidotes from different samples show considerable compositional variation,whereas those from the same sample are quite similar in composition, indicating that their composition is related. to bulk composition. As for epidotes from blueschist, X(ps)=0.22-0.36, and their composition varies remarkably even.in the same sample. In general, fine-grained epidotes contain relatively low ps while things are just the opposite for coarse--grained ones which commonly exhibit zonal structure characterized by the gradual decrease of ps towards the core, suggesting that the bluescbist might have experienced a pressuree-decline metamorphic process. In addition, a few pumpellyites are occasionally observed in the group; nevertheless, they are all enveloped in epidotes and fail to constitute an independent metamorphic facies.