[en] Detailed measurements of I-V characteristics and temperature dependence of resistivity for thin film YBa₂Cu₃O_7-x in the absence of the applied field have been made. The I-V characteristics were found to follow a power law behavior V proportional to I^a(T), and the temperature dependence of α(T) and ρ(T) can be fitted with K-T theory. The results manifest quasi-two-dimensional nature of the oxide superconducting thin film YBa₂Cu₃O_7-x. A deviation of I-V curves from the power law behavior in higher currents is presents is presented and discussed