With　surrounding　temperature　changing,　the　shifting　characteristics　of　the　filtered　spectrum　of　Panda　high　birefringence　loop　mirror　are　researched,　according　to　the　birefringence　laws　of　Panda　high-birefringence　fiber　and　filter　properties　of　the　high-birefringence　fiber　loop　mirror.　Its　sensitivity　coefficient　is　up　to　1.4219x10(-9)m/degrees　C.　The　transmission　spectrum　is　shifted　to　short　wave　band,　and　the　temperature　sensitivity　is　20　times　higher　than　that　of　the　fiber　grating　sensors,　when　the　temperature　rises　up.　This　temperature　sensing　sensitivity　is　simulatated　when　the　structural　parameters　are　changed,　such　as　the　stress　area＇s　radius　expressed　as　R,　the　high-birefringence　optical　fiber＇s　length　denoted　as　L　and　the　distance　between　the　core　of　the　fiber　and　the　stress　area＇s　central　point　marked　as　d.　While　the　stress　area＇s　radius　and　the　high-birefringence　optical　fiber＇s　length　are　increased,　the　temperature　sensitivity　of　the　Panda　high-birefringence　loop　mirror　would　become　larger　in　its　absolute　value　correspondingly.　On　the　contrary,　the　temperature　sensitivity　would　descend　as　the　distance　between　the　core　of　the　fiber　and　the　stress　area＇s　central　point　is　increased.　Furthermore,　the　influence　on　the　temperature　sensitivity,　which　is　induced　by　changing　the　internal　structural　parameters　of　the　high-birefringence　optical　fiber,　is　up　to　10,000　times　greater　than　the　impacts　resulted　in　by　varying　the　fiber　length　L　with　the　high-birefringence　fiber　loop　mirror.