Abstract: The influences of pickling conditions on the purification effect of the titanium product from indirect-contact metallothermic reduction were investigated. The experiment results show that it is feasible to remove oxides and impurity elements from metallothermic reduction product by acid pickling for producing high-purity titanium. Titanium doesn't react with acetic acid, but dissolves in hydrochloric acid slowly, and thus the pickling time should not be too long. Otherwise the titanium loss due to dissolution will lead to decrease of its yield. With the increase of acid concentration and pickling time, the purity of metallic titanium increases. Considering the purity and the yield of titanium, the optimum pickling conditions are determined as the combination of 50% volume concentration acetic acid for 6 h and 20% volume concentration hydrochloric acid for 0.5 h.