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In this paper, a higher order shear deformation theory is used to analyse the thermo-mechanical bending response of perfect-imperfect rectangular plates for hybrid ceramic and metal type (FGP) functionally graded plates with porosities. Based on the mixing law, the FG porous material qualities fluctuate with the thickness of the FGP layer. The equilibrium equations are found using the total potential energy approach. For simply supported (FGP) porous plates, the thermo-mechanical response is calculated. Analytical research shows the correctness of the existing high-order shear deformation theory in predicting the thermo-mechanical response of perfect-imperfect rectangular FG plates. Geometric characteristics, thickness ratios, gradient indices, porosity coefficients, mechanical loading, and thermal loading are all covered. According to the findings, the proposed hypothesis is more likely to be correct when it comes to the thermo-mechanical response of FG porous plates.