This　paper　presents　an　ultra-wideband　variable　gain　low　noise　amplifier　(UWB-VGLNA).　At　the　input　stage,　a　common　emitter　and　common-base　amplifier　with　serial-parallel　feedback　network　and　active　bias　network　was　used　to　achieve　good　wideband　input　impedance　matching　At　gain-tuning　stage,　a　combinational　circuit　consisting　of　active　inductor　load　and　Darlington　cascode　amplifier　with　gain　tuning　transistor　was　employed　to　not　only　realize　the　tunable　output　gain,　but　also　increase　gain　and　achieve　greater　gain　tunable　range.　At　the　output　stage,　a　common-collector　amplifier　with　tunable　current　mirror　was　designed　to　achieve　good　wideband　output　impedance　matching　and　extend　gain-tuning　range.　The　UWB-VGLNA　is　designed　based　on　the　standard　WIN　0.2　mu　m　GaAs　HBT　process.　The　UWB-VGLNA　showed　S-21　tunable　range　from　8.7dB　to　29.1dB;　the　S-11　of　less　than　-10dB;　the　S-22　of　less　than　-11dB;　the　NF　of　less　than　4.3dB;　the　stability　coefficient　(Mul)　of　over　3.　The　static　power　consumption　is　less　than　34mW　under　the　operation　voltage　of　4V.