Gas entrainment is a common phenomenon in the pool container with free surface.Its effect was not being taken seriously in our country.Butwith the development of liquid metal fast breeder reactor,the hazard of gas entrainment phenomena gradually had been paid attention.On the Gas entrainment is a common phenomenon in the pool container with free surface .Its effect was not being taken seriously in our country.Butwith the development of liquid metal fast breeder reactor, the hazard of gas entrainment image gradually had been paid attention.On the