This　paper　presents　a　new　cone　frustum　based　method　for　evaluation　of　the　machining　precision　of　five-axis　numerical　control　(NC)　machine　tools　with　the　purpose　of　reducing　the　evaluation　time　and　the　evaluation　cost.　The　method　uses　the　theory　of　homogeneous　transfer　matrix　(HTM)　to　establish　the　kinematic　error　model　of　machining　a　cone　frustum　on　a　five-axis　NC　machining　tool,　and　simulates　the　machining　of　the　cone　frustum　using　the　computer　aided　manufacturing　(CAM)　software　Unigraphics　NX4　(UG　NX4)　to　obtain　the　NC　codes　for　machining　the　cone　frustum.　Then　the　roundness　error　of　the　cone　frustum　is　calculated　through　the　spatial　relationship　between　cutting　tool　and　workpiece　according　to　the　established　model　and　the　NC　codes.　Based　on　this,　the　machining　precision　of　the　five-axis　NC　machine　tool　is　predicted.　The　simulation　results　demonstrate　that　the　presented　method　is　effective　and　can　be　used　in　practice.