The　quality　of　the　final　prints　in　electronic-shaft　paper-folding　machinesseriously　influenced　by　the　mechanical　periodic　disturbance.　This　paper　takes　the　periodic　shock-disturbance　and　sinusoidal　disturbance　in　the　electronic-shaft　paper-folding　machineas　as　the　research　objects.　Disturbance　observer　is　designed　based　on　Propotional　Integral　Diffrential　(PID)　control　algorithm.　Firstly　this　paper　establishes　a　model　of　the　system　with　MTALAB　system　identification　tools　in　the　process　of　establishing　the　control　system.　Secondly,the　paper　inverses　this　established　model.　In　order　to　approximate　the　mode　and　guarantee　the　stability　of　the　inversed　model,　zero-phase　error-tracking　controller　(ZPETC)　has　been　designed　to　remove　the　instable　zero-point　of　the　original　model.　Finally,　the　paper　constructs　the　disturbance　observer　of　the　established　reversed　model　based　on　PID　control　algorithm.　The　simulation　on　experimental　platform　shows　that　the　resistivity　of　paper-folding　machine　to　the　external　disturbance　has　been　improved　impressively　and　the　proposed　PID　algorithm　disturbance　observer　has　been　proved　can　be　used　in　periodic　disturbance　suppression　in　the　electronic-shaft　paper-folding　machine.　©　2018,　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.