Abstract: The facilitated transport of propylene through supported liquid membranes containing silver nitrate as a carrier was realized.The effects of different technological conditions and membrane material etc.on the purity of propylene,the Permeation rates,once through yield of propylene and the selectivity factor were studied.Under best conditions,the purity of propylene is up to 99.3%～99.7%, the selectivity factor more than 700,once through yield of propylene up to 5.6%.The ways of improving supported liquid membranes stability were given.The Process of facilitated transport through supported liquid membranes is proved by practice to be superior to the process of dissolution-diffusion.