In　this　paper,　the　high　thermo-optic　coefficient,　and　enhancing　sensitivity　with　temperature,　high　birefringence　PCF　filled　in　ethanol　was　manufactured　by　temperature　sensor　of　filling　the　air　holes　with　ethanol.　The　theoretical　model　of　high　birefringence　PCF　has　proposed　by　the　plane　wave　expansion　method,　at　the　same　time　the　temperature　impacts　of　the　birefringence　and　beat　length　in　high　birefringence　PCF　which　filled　with　ethanol　were　numerical　analyzed.　The　birefringence　increases　as　a　beat　length　decreases　with　a　wavelength　increases.　Especially　high　birefringence　PCF　is　more　sensitive　to　temperature　with　the　long　wavelength,　which　is　a　reference　significance　in　useful　to　design　temperature　sensors.