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Pd/Y-ZrO₂ catalysts were prepared by Y-ZrO₂ with different morphologies (flower-like, spherical, reticulated, and bulk-specific morphology), which were prepared by hydrothermal synthesis. Activity evaluation and characterization results show that the morphology influences the microstructures of Y-ZrO₂ and the chemical states of active Pd species, thus affecting the activity of methane oxidation. Bulk Pd/Y-ZrO₂ exhibits the best CH₄ oxidation activity and thermal stability due to the block shape exposed (101) surface, and the single tetragonal phase structure maintained after high-temperature aging. The relatively large-sized Pd particles and Pd⁰ jointly promote the catalytic oxidation of CH₄.