This series product non-toxic, without excitant,solube in water,ethanol and a variety of organic solvents,insoluble in most of the fatty hydrocarbon and ethyl ether, in accordance with different relative molecular mass and different nature,with the increase of molecular weight of the moisture absorption ability, and the corresponding lower solubility, and the freezing point, relative density,flash point and viscosity increase.Polyethyleneglycol(peg) is a water-soluble polymer of ionic with many high polarity substances such as protein,starch,nitro cellulose,polyvinyl acetate compatibility or partial compatibility,can make the lives of antibiotics is reduced,especially the penicillin and bacitracin.