To further improve temperature measurement precision of Brillouin optical time-domain analysis（ BOTDA）

a temperature sensing and measurement system which based on BOTDA is constructed. It is found that the protective layer of temperature measuring optical fiber affects precision of temperature measurement

and the bare fiber has higher precision

but also is affected easily by environment and is easily broken

so improve protective layer of optical fiber can improve measurement precision. Propose a kind of temperature measurement method which uses thermal grease apply on optical fiber

improves accuracy of temperature measurement.