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In this study, the switching behavior of ferroelectric polarization of (0001) YMnO3 epitaxial films at around Neel temperature was investigated. From the experimental results of the frequency and temperature dependences of coercive electric filed (Ec) obtained from polarization-electric field (P-E) hysteresis loop, the cross-correlation phenomena between magnetics and ferro-electrics are discussed in detail. The P-E hysteresis loops of the films were measured in the frequency range from 1 Hz to 10 kHz, and the temperature was varied from 10 to 150 K. Frequency dependence of Ec accorded with Ishibashi-Orihara's theory at the measured temperature range. However, temperature dependence of Ec disagreed with Devonshire's theory below 120 K, which is close to the Neel temperature of the YMnO3 epitaxial film.