Direct　methanol　fuel　cells(DMFCs)　are　one　of　the　most　promising　candidates　for　the　next　generation　power　sources　in　miniature　electronic　devices　due　to　their　high　energy　density,　convenient　storage　of　fuel,　simple　structure.　DMFCs　use　methanol　as　fuel　at　anode　and　oxygen　or　air　as　oxidant　at　cathode,　and　these　reactants　are　consumed　at　porous　electrode　by　electrochemical　reactions　which　lead　to　their　concentration　fluctuation　and　cell　performance　variation.　So,　adequate　detection　of　the　reactant　concentration　is　necessary　for　operating　DMFC　systems,　because　they　have　important　influence　on　the　performance,　efficiency　and　fuel　utilization.　In　this　paper　the　methods　for　measurement　of　reactants　concentration　in　the　DMFC　are　reviewed,　and　can　be　generally　classified　into　physical　and　chemical　two　groups.　Comments　and　analysis　are　given　on　their　basic　principles　and　application　range　as　well　as　their　merits　and　demerits.　©　All　Rights　Reserved.