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Thermal conductivity kdominates in a heat transfer medium, and a field modulated kwould facilitate delicate control in thermal management technology, yet it is hardly realized in a single solid material unless with changing temperature. Herein, in BaTiO3ceramic, a modulated kwas discovered by adjusting ferroelectric polarization P, which was a conventional strategy in ferroelectric functional materials. Four different states (P1, P2, P3, P4) were obtained by controlling poling time and field strength, showing that kleaped from 2.704 ± 0.054 to 3.201 ± 0.070 W (m K)−1with increased P. Moreover, the strong correlation between Pand kwas also verified by the thermal depolarization measurement from room temperature to Curie temperature. The underlying origin of Pmodulated kwas attributed to the internal bias field, which is born in the oriented ferroelectric domains, tightening special phonon modes in BaTiO3ceramics. Raman spectrum, P–Eloops, first-order reversible curve, XRD analysis, and PFM measurement were then employed to clarify how ferroelectric polarization structurally influences phonon transport and subsequent thermal conductivity. This work will pave a brand-new research route for conventional ferroelectric ceramic, also potentiating the idea of the electric field-controlled kcomponent and active solid heat-transport device in the future.