Abstract: On the basis of the calculation of compressed roller area and the rubber rigidity test, the authors give a method of calculating the elastic pressure of offset rollers and the waveform of time domain. They first discuss the concept of compression -rigidity of offset roller rubber and point out that the rubber pressure is about directly proportional to the compressed area and the rubber width, that is to say, the compression rigidity is directly proportional to the compressed area; Then, they discuss the method of adopting integral method to calculate the compressed area and give out the integral formula and its corresponding calculation result. On the basis of calculating the compressed area, the elastic pressure of offset roller is calculated so as to obtain its waveform; Finally, the authors show the elastic pressure frequency spectrum obtained from the FFT (fast Fourier transform) analysis on the pressure waveform.