Rats　are　often　used　in　the　electromagnetic　field　(EMF)　exposure　experiments.　In　the　study　for　the　effect　of　900　MHz　EMF　exposure　on　learning　and　memory　in　SD　rats,　the　specific　absorption　rate　(SAR)　and　the　temperature　rise　in　the　rat　head　are　numerically　evaluated.　The　digital　anatomical　model　of　a　SD　rat　is　reconstructed　with　the　MRI　images.　Numerical　method　as　finite　difference　time　domain　has　been　applied　to　assess　the　SAR　and　the　temperature　rise　during　the　exposure.　Measurements　and　simulations　are　conducted　to　characterize　the　net　radiated　power　of　the　dipole　to　provide　a　precise　dosimetric　result.　The　whole-body　average　SAR　and　the　localized　SAR　averaging　over　1,　0.5　and　0.05　g　mass　for　different　organs/tissues　are　given.　It　reveals　that　during　the　given　exposure　experiment　setup,　no　significant　temperature　rise　occurs.　The　reconstructed　anatomical　rat　model　could　be　used　in　the　EMF　simulation　and　the　dosimetric　result　provides　useful　information　for　the　biological　effect　studies.