AbstractBased on gel electrophoresis method,the gene diversity of Fagus lucida,F.pashanica and F.engleriana was studied in this paper.The allozymes determined include peroxydase(PX₁ and PX_２), phosphogluconate dehydrogenase(PGD), superoxyde dismutase(SOD), glutamate oxaloacetate transaminase(GOT₁ and GOT₂),isocitrate dehydrogenase(IDH),menadione reductase(MNR),phosphoglucomutase(PGM_１ and PGM₂), and malate dehydrogenase (MDH₂). We have determined and analysed the allelic frequency and the genetic distances of the three beeches, and provided some scientific information for the further studies of taxonomic relations and systematic evolution of the beeches.