The barium sulfate weight method can be used to identify barium in silicon aluminum barium sample. Laboratory technicians can dissolve test specimen with the acid, and recover the in dissolvable sample. Then they can selects the EDTA complexion disturbance element. Under the acidic condition, the barium and the sulfate radical form the barium sulfate precipitation. The method is applied in the barium determination in the silicon aluminum barium alloy, and the result is satisfying.