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NZ2 zirconium alloy plate samples of 1.4 mm thickness were prepared at different hot rolling temperatures of 800, 700, 650 and 610 °C but under the same rolling reduction. The distribution and types of the secondary phases in the alloy were observed by OM, SEM and TEM. Furthermore, their sizes were calculated and the distribution rule was obtained by software. Results show that most secondary phases are in the grains while a few in the grain boundary. They are mainly spherical or claviform. Homogeneous and fine secondary phases distributing dispersively can be obtained at a lower rolling temperature (650 °C)