Because　of　its　compact　size　and　portability,　optical　fiber　has　been　wildly　used　as　optical　paths　in　frequency-scanning　interferometers　for　high-precision　absolute　distance　measurements.　However,　since　the　fiber　is　sensitive　to　ambient　temperature,　its　length　and　refractive　index　change　with　temperature,　resulting　in　an　optical　path　length　drift　that　influences　the　repeatability　of　measurements.　To　improve　the　thermal　stability　of　the　measurement　system,　a　novel　frequency-scanning　interferometer　composed　of　two　Michelson-type　interferometers　sharing　a　common　fiber　optical　path　is　proposed.　One　interferometer　defined　as　origin　interferometer　is　used　to　monitor　the　drift　of　the　measurement　origin　due　to　the　optical　path　length　drift　of　the　optical　fiber　under　on-site　environment.　The　other　interferometer　defined　as　measurement　interferometer　is　used　to　measure　the　distance　to　the　target.　Because　the　optical　path　length　drift　of　the　fiber　appears　in　both　interferometers,　its　influence　can　be　eliminated　by　subtracting　the　optical　path　difference　of　the　origin　interferometer　from　the　optical　path　difference　of　the　measurement　interferometer.　A　prototype　interferometer　was　developed　in　our　research,　and　experimental　results　demonstrate　its　robustness　and　stability.　Under　on-site　environment,　an　accuracy　about　4　mu　m　was　achieved　for　a　distance　of　about　1　m.