In　this　work,　a　1550-nm　full-fiber　Doppler　lidar　via　software-defined　platform　is　built　to　realize　flexible　and　low-cost　contactless　vibration　measurement　of　high-voltage　power　equipment.　A　1550-nm　fiber　layout　is　de-signed　to　generate　optical　interference　between　vibration　signal　and　carrier　wave.　The　reflected　vibration　signal　is　collected　by　an　optical　transceiver　and　the　carrier　wave　is　generated　by　an　acousto-optic　modulator　(AOM).　The　optical　beat　signal　is　collected　by　a　balanced　detector　(BD)　then　sent　into　a　general　software　defined　radio　(SDR)　re-ceiver.　By　GNU　developing　platform,　the　target　mechani-cal　vibration　signal　is　demodulated　and　several　flexible　functions　such　as　speed-acceleration　trans,　harmonic　com-ponent　analysis　and　fault　diagnosis　is　realized.　Perfor-mance　of　Doppler　lidar　is　first　verified　on　mechanical　vibration　source　by　PZT　vibration　actuator,　results　show　that　the　designed　lidar　could　retrieve　50　Hz–20　kHz　me-chanical　vibration　signals　within　the　working　distance　is　up　to　20　m.　Further　case　application　scenarios　on　the　power　transformer　and　gas-insulated　switchgear　(GIS)　are　also　conducted　to　verify　the　feasibility　of　proposed　lidar.　©　(2023),　(Czech　Technical　University).　All　Rights　Reserved.