Quarter-wave　plate　is　a　key　component　in　fiber　current　sensing　system.　A　quarter-wave　plate　fabricating　technique　is　proposed　and　demonstrated.　The　two　sections　of　high-birefringence　fibers　(HBF)　with　approximately　equal　length　are　orthogonally　fused　and　the　angle　between　their　fast　axes　is　90°.　Stretching　one　of　two　fibers　can　adjust　the　phase　difference　between　the　two　fibers　to　be　π/2　precisely.　A　high-birefringent　fiber　loop　mirror　(Hi-Bi　FLM)　is　realized　by　the　two　fibers　fused　to　3　dB　coupler　and　the　phase　difference　is　determined　by　real-time　detection　of　the　transmissivity　of　the　Hi-Bi　FLM.　The　transmissivity　function　of　the　Hi-Bi　FLM　is　deduced　and　the　variation　of　the　transmissivity　is　analyzed　in　detail.　The　phase　difference　is　confirmed　experimentally　based　on　the　transmissivity　curve　and　its　slope.　The　fabricating　technique　which　has　been　achieved　experimentally,　and　has　excellent　features,　such　as　high　accuracy　and　convenient　operation.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.