Abstract: Selected ivy(Hedera nepalensis vaur．sinensis)growing in open field and greenhouse separately as the experimental material，the fluidity an d the composition of fatty acids in phospholipids isolated from the leaves
were determined by fluorescence polarization，scanning thin—layer chroma tography and gas chroma tography methods．The results showed that ivy growing in ope n field in January possessed the higher level of unsaturated phospholipids (PC and PE)and fatty acids(16：1+18：1+18：2+18：3)than that growing in greenhouse． For ivy g∞ in open field，phosphatidyl—choline (PC )Was the main factor to influence its membralle—lipid fluidity during it
adapted to the low—temperature stress． By an alyzing the diferences of fluidity an d composition of phospholipids from the leaves of ivy growing in diffe~nt temperature conditions， the mechan ism of the cold—resistance of evergreen broad—leaved plant in terms of the composition and the structure of membrane—lipids were discussed．

Key words: Hedera nepalensis, Phospholipids, Fatty acids, Membrane—lipid fluidity, Cold—resistanc