Abstract: To investigate the measurement method of flue gas flow, the advantages and disadvantages of current main carbon verification methods are analyzed. The background and significance of carbon emission research, as well as the progress of related research at home and abroad, are described. A method for measuring flue gas flow using an S-type pitot tube is proposed based on the measurement principle of flue gas flow. Two integration methods of equal area and equal distance are proposed based on the study of pitot tube velocity measurement principle and the flow measurement method of velocity area method. The installation position of the pitot tube, the measurement points of the flue section, and their distribution in the two integration methods are compared. The rationality and advantages of the two integration methods of equal area and equal distance are analyzed and compared theoretically. To verify the rationality of the two integration methods, the results measured by the two integration methods are analyzed and compared based on the laboratory wind tunnel device. It is concluded that the deviation of the two methods is large at low flow rate, and the deviation of the two integration methods is about 0.5% at high flow rate, which provides technical support for the accurate measurement of measured smoke and air flow. The study suggests that the proposed measurement method using S-type pitot tube is a reliable and effective way for measuring flue gas flow.