A　trapezoidal　cantilever　density　sensor　based　on　MEMS　(Micro　Electro　Mechanical　Systems)　technology　is　used　to　measure　the　density　of　toluene　and　0.65　cs　dimethyl　silicone　oil　at　26~34°C　and　30~50°C,　respectively.　Toluene　is　used　as　a　standard　solution　to　calibrate　the　working　parameters　of　the　trapezoidal　cantilever　density　sensor.　The　density　values　of　toluene　at　26°C,　30°C　and　34°C　are　measured　and　the　maximum　and　the　average　absolute　deviations　of　the　measurements　from　the　references　are　0.70%　and　0.43%,　respectively.　The　density　values　of　0.65　cs　dimethyl　silicone　oil　are　also　measured　and　compared　with　references.　The　maximum　and　the　average　absolute　deviations　of　the　measurements　from　the　references　are　4.21%　and　4.16%,　respectively.　And　the　deviations　are　less　than　5%,　meeting　the　need　of　engineering.