Abstract: The continuous flow method for determining pectin in tobacco was improved,the pectin in tobacco was rapidly determined following impurity removing with acidic alcohol solution,extracting with weak acid and coloring with m-hydroxydiphenyl method.The results showed that:1) The loss rate of tobacco component was less than 0.2% during the process of impurity removing.2) The time required for sample pretreatment was only three hours.3) The sample was of high stability,the relative variation of the test results was lower than 1% within 48 hours.4) The influence of small molecular sugars on test results was under 0.3%.5) The recovery of this method ranged from 96% to 104%.