Abstract: Abstract：When the rusted diamond circular saw blade works, there will be some problems such as reduced sawing stability. In response to this phenomenon, the models are established through the structural parameters of saw blade with different corrosion degrees, and modal analysis of saw blades with different corrosion degrees are carried out, which took sawing vibration as a reference index of stability and studies the influence of saw blade corrosion on stability, and experiments verify the accuracy of the results. The results show that the vibration modes of the corroded saw blade more 6 orders than those of the original saw blade, and the difference of adjacent natural frequencies reduce 7.08% in the frequency range of 640~1280 Hz. With the increase of corrosion degree, the saw blade is more prone to resonance. The corrosion at the important position has great influence on the sawing stability of the saw blade. The corrosion can be reduced by reducing the surface defects, and the influence on the sawing stability of the saw blade can be reduced. This study provides guidance for the practical use and rust prevention technology of diamond circular saw blades.