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Collagen/chitosan composite nanofibrous membranes have a good potential use for wound dressing.Chitosan can be electrospun with collagen at a very low concentration.However,with the addition of PEO,the concentration of chitosan can be increased.The aim of this paper was to study the properties of collagen/chitosan nanofibrous membranes with different weight ratios and different PEO concentrations.SEM was used to observe microstructure of electrospun samples.