Abstract: In order to standardize the methods for testing stiff force and stiffness of fold line pressed on packet blank,the points for cutting samples and positions of testing were determined by comparing and analyzing the testing results of the stiff force and stiffness of fold lines with respect to different printing positions and different line orientations that satisfied the requirements of running on packaging machines in Changsha Cigarette Factory,the proper ratio of stiff force to stiffness should be in the range of 7-10.