Using　the　typical　WC-Co　cemented　carbide　as　an　example,　the　interactions　of　dislocations　within　the　ceramic　matrix　and　the　binder　metal,　as　well　as　the　possible　cooperation　and　competition　between　the　matrix　and　binder　during　deformation　of　the　nanocrystalline　cermets,　were　studied　by　molecular　dynamics　simulations.　It　was　found　that　at　the　same　level　of　strain,　the　dislocations　in　Co　have　more　complex　configurations　in　the　cermet　with　higher　Co　content.　With　loading,　the　ratio　between　mobile　and　sessile　dislocations　in　Co　becomes　stable　earlier　in　the　high-Co　cermet.　The　strain　threshold　for　the　nucleation　of　dislocations　in　WC　increases　with　Co　content.　At　the　later　stage　of　deformation,　the　growth　rate　of　WC　dislocation　density　increases　more　rapidly　in　the　cermet　with　lower　Co　content,　which　exhibits　an　opposite　tendency　compared　with　Co　dislocation　density.　The　relative　contribution　of　Co　and　WC　to　the　plasticity　of　the　cermet　varies　in　the　deformation　process.　With　a　low　Co　content,　the　density　of　WC　dislocations　becomes　higher　than　that　of　Co　dislocations　at　larger　strains,　indicating　that　WC　may　contribute　more　than　Co　to　the　plasticity　of　the　nanocrystalline　cermet　at　the　final　deformation　stage.　The　findings　in　the　present　work　will　be　applicable　to　a　large　variety　of　ceramic-metal　composite　materials.