Photonic crystal fibers (PCFs) are investigated. The polarization cross-coupled distributions of both polarization-maintaining photonic crystal fiber coil and ordinary polarization-maintaining fiber coil are tested at various temperatures utilizing white light interferometers. Changes of polarization coupling intensities of fixed polarization cross-coupled points in fiber coils at different temperatures are also analyzed. The obtained results show that, in the temperature range between -40 ℃ and 50 ℃, the maximum change rate of polarization coupling intensity of photonic crystal fiber coil is 0.97%, while that of ordinary polarization maintaining fiber coil is 4.71%, which is almost five times as the former one. Thus it can be concluded that the coupling intensity of photonic crystal polarization maintaining fiber coil possesses better stability against temperature changes than that of ordinary polarization-maintaining fiber coil.