In　this　paper,　a　method,　by　which　the　swing　axle　torsional　angle　of　sheet　feeding　shaft　of　printing　press　is　measured　based　on　encoders,　is　introduced.　Then,　the　design　method　of　the　data　acquisition　system　and　signal　processing　software　for　measuring　torsional　angle　is　discussed　in　detail.　The　swing　axle　torsional　vibration　of　test　bed　designed　by　the　author　is　measured　by　the　measurement　system　also　designed　by　the　author　based　on　the　ZonicBook/618E　data　acquisition　device,　and　the　analytical　results　are　obtained.　Test　results　proved　that　the　swing　axle　torsional　vibration　signal　could　be　measured　by　this　method.　The　presented　method　to　measure　torsional　vibration　signal　of　swing　axle　is　put　forward　for　the　first　time　in　China　and　it　might　provide　important　reference　for　research　in　the　related　field.