Abstract: In the paper, a new method to evaluate the pressure of long-distance gas pipelines based on Barkhausen noise technology to detect inner pressure of pipeline is brought forward, that is, first the pressure data is obtained by Barkhausen sensors distributed at equal-distance along the pipeline axes and the theoretical pressure of the sensor's position, and the ratio of the sensor data and theory result are obtained, and then the ratio is processed with multi-sensor data fusion method to obtain respective results and comparison is made to the results based on different methods. The results of data simulation fitting display that this method can be taken as a newly effective method to evaluate the pressure of gas transmission pipelines.