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To investigate the hydrogen permeability of calcium fluoride used for electroslag remelting (ESR) process,“Gas-slagmetal” osmosis process under argon atmosphere saturated with water vapor at 318 K was used to study the hydrogen permeability of slag containing calcium fluoride.The results indicate that the conventional slag,consisting of 70％ CaF2 and 30％ Al2O3,has the lowest hydrogen permeability.A parameter EH was proposed for evaluation of the hydrogen permeability of slags containing calcium fluoride.The hydrogen permeability decreases with increasing EH to a certain extent.An appropriate choice of slag for the ESR process can be obtained.These results also suggest that the hydrogen pick-up in steel after remelting might be reduced when a slag with low hydrogen permeability is used.