Abstract: According to Tianjin Pipe practice of charging hot metal to a modern electric arc furnace, it was known that the hot metal charging technology could increase the economic benefit and expand the EAF steel grads. Compared the traditional arc furnace with the oxygen converter, the depth of the pool of a modern EAF should be between the EAF's and the basic oxygen converter's. Compared the changes of the cost with the profit and the negative influence of charging hot metal, the proportion of the charging hot metal was determined. The best place to charge hot metal into a modern EAF was the back of the opening acidic. The temperature of the hot metal should be higher than 1200℃. Silicon in hot metal should be lower than 1.0% (mass fraction), and the best should be lower than 0.5%.