Avain infectious bronchitis virus membrane gene liposomes were prepared with the modified reverse phase evaporation method and the physicochemical property was studied.Electron microscope observation showed that the liposome suspension was heterogeneous and the particle size ranged from 30 to 400 nm with a average diameter of 120 nm.The vesicles showed unilamellar and multilamellar structure.The plasmid DNA remained intact and could be stored at 4 ℃ for at least one month in liposomes and it was also resist...