Due to Silicon (Si) material abundance and specific properties, monolithic integration of III-V semiconductors on (Si) is of paramount importance for the next-generation in Optoelectronic devises. An alternative approach to lattice mismatched single silicon crystal substrates for heteroepitaxy is proposed. In this work, we have suggested a design of a compliant virtual substrate and we have explored the modulation of stress/lattice parameter of a window layer based on porous silicon pseudo-substrates allowing a defect free epitaxial growth. We prepared a silicon window layer with low porosity and variable thicknesses whose stress is modulated by the succession of several layers with gradual porosity. As a result, we evaluated the stress and the lattice parameter in compliant substrate before and after thermal annealing. The pores reorganization process was supported in Argon atmosphere at constant temperature (900 °C). The samples were studied morphologically by Field Emission scanning Electron Microscope (FE-SEM) and structurally by High Resolution X-Ray Diffraction (HR-XRD) and Nano-Raman.