To improve the rate of gas-blow drainage of wet pulp in pulp molding, we tried steam-blow drainage of the wet pulp in the mold instead of air. In this procedure, the temperature of water in the pulp is increased rapidly to the saturated steam temperature, due to the conductivity of condensation of steam, and the viscosity and surface tension of the water are greatly decreased. As a result, we obtained a high efficiency of gas- blow drainage. Additionally, we have proposed an equation for the rate of drainage which depends on the temperature and the time in the state where the temperature, the pressure and the values of properties are changing.