This paper describes the design of a 6-component force/moment calibration machine with having the maximum capacities of 500 N in forces and 50 Nm in moments. To be used for the characteristic of a multi-component load cell. this machine consists of a body, a fixture, a force generating system, a moment generating system and weights. We have also evaluated the accuracy of the calibration machine. Test results show that the expanded relative uncertainty for force components $pmFx,;pmFy;and;moment;components;pmMx,;pmMy;are;less; than;8.6 imes10^{-4}$, and force components +Fz, -Fz and moment components $pmMz;is;less;than;1.6 imes10^{-3},;2.0 imes10^{-5},;1.7 imes10^{-3}$ respectively.