For the problem of the change of capillary tube induced by thermal expansion and contraction with temperature change, a new temperature compensation method applied in extrinsic Fabry-Perot interferometric (EFPI) optical fiber sensor is proposed. Temperature compensation film (copper film in this paper) is deposited on the reflective fiber within silica tube to compensate the gap change caused by temperature variation. The experimental results prove the effectiveness of this method and a linear relationship between axial length of copper film and temperature compensation length is found. In experiment, the temperature compensation coefficient of 1 mm axial length copper film reaches 0.49 nm/℃.