Abstract: A new ICP-MS method with directly injection of determination of trace arsenic,mercury and lead in gasoline was established.This method is more advanced than the foregone method of dissolving sample.The internal standard quantity method avoid the effect which from the fundus of sample.This method can determine the content of arsenic,mercury and lead in gasoline,the detection limit is 0.05 μg/kg and the recovery efficiencies of each element vary from 92% to 104%.This method is safety,simple,rapid and accuracy.