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The shallow seismic wavefield is mainly inverted using the elastic or viscoelastic approximation. In this work, we make the first attempts towards the poroelastic FWI (PFWI) of the shallow-seismic wavefield. Based on the description of the shallow subsurface as a fluid-saturated Biot medium, we explore the feasibility of time-domain FWI for poroelastic media. Here, the PFWI is applied to two synthetic models to reconstruct the material properties. Rayleigh wave is involved during the PFWI in P-SV mode, and Love wave is contained during the inversion in SH mode. The inversion results for the porosity illustrate that PFWI can recover the rock properties successfully, and PFWI in SH mode can achieve closer porosity results to the actual targets.