Solenoid　valves　are　a　kind　of　electric　appliance　applied　widely.　It　has　significant　meaning　to　analyze　the　electromagnetic　field　and　temperature　field　of　the　electromagnetic　mechanism　to　improve　the　performance　indexes.　In　this　paper,　it　gives　an　idea　to　calculate　the　stable　temperature　of　the　electromagnetic　mechanism　through　the　coupling　of　the　electromagnetic　field　and　the　temperature　field.　3D　finite　element　model　of　solenoid　valve　has　been　built.　The　power　loss　of　the　electromagnetic　mechanism　is　calculated　from　the　magnetic　field　and　the　distribution　of　the　temperature　field　can　be　calculated　from　the　temperature　model.　The　models　have　been　verified　through　numerous　experiments.　Meanwhile,　the　influence　on　the　temperature　distribution　of　the　electromagnetic　mechanism　caused　by　the　coil　turns,　wire　diameter,　thickness　of　electromagnetic　yoke　and　encapsulate　layer,　fill　factor　and　material　features　are　discussed　in　this　paper.　It　will　lay　the　foundation　for　the　optimization　design　of　solenoid　valves.　©　2012　Chin.　Soc.　for　Elec.　Eng.