A　small　passive　direct　methanol　fuel　cell,　which　can　operate　in　any　orientation,　has　been　developed.　Dynamic　response　of　cell　voltage　to　current　load　variation　of　passive　fuel　cells　has　been　studied　experimentally.　The　experimental　results　show　that　when　current　is　loaded,　output　voltage　of　fuel　cells　with　methanol　concentration　of　9　mol/L　is　higher　and　steadier　than　that　of　fuel　cells　with　methanol　molarity　of　5　mol/L.　When　the　current　is　low　or　unloaded,　the　voltage　of　fuel　cell　with　anode　fuel　concentration　of　5　mol/L　is　higher　than　that　with　9　mol/L　molarity.　When　the　solution　concentration　is　low,　the　higher　the　discharge　current　density　is,　the　unsteadier　the　output　voltage　is.　The　analysis　and　discussions　of　mass　transfer　coupling　with　electrochemical　reactions　inside　passive　fuel　cell　have　been　conducted　to　explain　the　experimental　phenomena.