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With the absence of on-situ temperature monitoring of optical fiber composite overhead ground wire(OPGW)for the process of sleet-thawing,early temperature warning and safety control of direct current(DC)in sleet-thawing process is difficult.Here we propose a Brillouin optical time-domain reflectometry(BOTDR)with broadband receiving for fast measurement and with distributed Raman amplification for long distance measurement of about 100 km.A field experiment for on-situ temperature monitoring of sleet-thawing of OPGW is also reported,which shows uneven change of temperature along the OPGW.The difference between the maximum and the minimum temperature change can be greater than 40℃.