The　algorithm　of　NURBS　interpolation　was　introduced,　it　is　the　key　for　NURBS　curve　interpolation　that　formula　of　Taylor　development　of　first-order,　derivation　of　two　order　in　the　interpolation　cycle　under　the　condition　of　certain　interpolation　increment　only　and　interpolation　speed,　by　changing　the　interpolation　increments　can　achieve　correction　curve　of　interpolation.　This　paper　introduces　a　method　using　DSP　motion　control　card　for　NURBS　curve　interpolation　methods,　this　method　can　not　only　shorten　the　interpolation　time,　also　can　be　controlled　by　motion　control　card　interrupt　timer　to　adjust　interpolation.　The　last　example　shows　that,　the　interpolation　algorithm　not　only　meet　the　control　requirements,　but　also　meets　the　requirements　of　high　speed　and　high　precision　interpolation.