By　the　reason　of　the　additional　side　force　acting　on　the　force　transducers　affecting　the　rotation　effect　of　the　combinatorial　load　cell,　the　paper　describes　the　effect　of　the　spherical　plain　thrust　bearing＇s　structure　on　the　additional　side　force.　A　three-dimensional　finite　element　model　of　the　late-model　high-accuracy　combinatorial　load　cell　was　established　and　analyzed.　From　the　results,　it　shows　that　the　magnitude　of　the　additional　side　force　fluctuation　increases　with　the　height　of　the　bearing　base　increasing.　At　the　same　time,　the　magnitude　decreases　with　the　friction　coefficient　of　the　inner　and　outer　ring　of　bearing　increasing.　The　results　provide　guidance　for　the　design　of　the　combinatorial　load　cell.