Abstract: Current calibration method of air permeability standards does not take into account the influences imparted by standard's position in the air circuit and atmospheric pressure variation on measurement results.Therefore,the method was improved by changing the arrangement of air permeability standard in air circuit for measurement from upstream to downstream of the flow-meter and dividing air permeability standards into two types,linear type and non-linear type.The influence of atmospheric pressure on the measurements of non-linear standards was calculated.The repeatability and stability of measuring method before and after improvement were compared,and the improved measuring method was adopted to take part in CORESTA collaborative experiments.The results showed that:1) After improvement,the standard deviation and variance coefficient of measurements,and the extreme difference of measurement results over five months for non-linear standards reduced by about 50%.2) The relative extreme difference of volumetric flow mean value of air permeability standards measured by ZTRI(Zhengzhou Tobacco Research Institute of CNTC) laboratory and three foreign laboratories were less than 2%,and the variance coefficients of measurements of each standard were all less than 0.50%.