A　novel　scheme　for　fabricating　Yb-doped　silica　micro　structured　optical　fibers　and　their　application　in　hightemperature　optical　fiber　sensing　are　reported.　The　Yb-doped　silica　micro　structured　optical　fiber　preforms　consisted　of　Yb-doped　silica　core　rods　(0.1　wt%　for　Yb2O3)　and　holey　pure　silica　claddings　fabricated　by　UVcurable　tube　molding　technology　and　digital　light　processing　3D　printing　technology,　respectively.　The　silica　preforms　were　drawn　using　the　rod-in-tube　method　to　Yb-doped　silica　micro　structured　optical　fibers　without　severe　distortion.　The　doped　micro　structured　fibers　were　applied　to　high-temperature　sensing　from　296.15　to　653.15　K.　The　proposed　technology　is　expected　to　be　effective　for　the　fabrication　of　various　types　of　rare-earthion-doped　silica　micro　structured　optical　fibers　that　can　be　used　in　fiber　sensors,　lasers,　and　amplifiers.