In accordance with the existing state of chlorine in tobacco leaves,the pre-treatment for testing was improved.By series tests,the transparent chlorine solution was obtained if 0.5000g tobacco leaves sample was extracted with 25 ml 0.2 mol/L H₂SO₄ for 20 min at 25℃,simultaneously,equiponderant activated carbon was added in order to decolorize the solution.The recovery of chlorine in the method was 101.4%~102.6%,the precision and accuracy were corresponded with the requirement.Both the time and the cost were greatly saved compared with the traditional method.Furthermore,the operation was simple in determining,so this method was adapt to be popularized.