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The decomposition of the metastable P phase in P Cez alloy has been studied during continuous heating up to 830°C. The heating rate varied between 0.25 and 5OC/s. Electric resistivity measurements, and hardness measurements revealed different phase transformations as temperature increased. Different samples were quenched from different temperatures during the heating range and were then studied by X-ray and TEM, allowing to correlate the changes in resistivity measurements to the beginning of the precipitations of the o and a phases and to establish the continuous heating transformation diagram. A change in the resistivity variations, not dependent on the heating rate was observed near 700°C. X-ray quantitative analysis and EAM studies revealed that the structure consisted of a maximal content of a phase, surrounded by P rich zones in the matrix. For temperatures greater than 700°C, the content of a phase diminished and the P phase was homogenized.