Abstract: Continuous casting and direct rolling(CC-DR) technology possesses energy-saving and carbon reduction advantages by omitting traditional reheating furnaces. However, during the conveying process, affected by external heat dissipation and internal heat transfer, slabs tend to form a non-uniform temperature field with a hot core and cold edges, which seriously affects the subsequent rolling load distribution and induces edge cracks. A single induction heating mode cannot effectively meet the temperature homogenization requirements of slabs. This study aims to reveal the precise heat compensation mechanism of continuous casting slabs under an initial non-uniform temperature field and explore the regulation law of induction heating process parameters on the evolution of three-dimensional temperature fields. A three-dimensional finite element model coupled with flow, electromagnetic and heat transfer was established for continuous casting slabs with a cross-section of 1 100 mm×230 mm. With the temperature uniformity index adopted as the quantitative evaluation index, the effects of coil combination mode, current intensity and current frequency on the three-dimensional temperature field and temperature homogenization characteristics of slabs were systematically studied.The results show that under the dual effects of skin effect and proximity effect, single transverse or longitudinal magnetic flux induction heating causes obvious edge overheating or insufficient overall heat compensation of slabs respectively. The staggered transverse and longitudinal coil combination mode can give full play to the advantages of longitudinal magnetic flux with good overall heating effect and transverse magnetic flux with targeted low-temperature compensation for slab edges, and improve the spatial distribution uniformity of the temperature field. Under this working mode, the temperature uniformity indices of the slab head-tail surface and the surface-core cross-section reach 0.98 and 0.96 respectively. Further parametric studies demonstrate that increasing current intensity or current frequency enhances the near-surface Joule heat and reduces the temperature difference between the surface and core of slabs, while excessive current or frequency aggravates the edge effect and reduces the temperature uniformity of the slab head-tail surface. Considering the temperature homogenization effects of both the slab head-tail surface and surface-core cross-section comprehensively, the optimal process parameters under the staggered transverse and longitudinal mode are a heating current of 8 000 A and a current frequency of 1 000 Hz, which achieves the optimal temperature distribution uniformity of slabs. The research results can provide theoretical guidance for the reasonable configuration and process parameter optimization of induction heaters in continuous casting-direct rolling production lines.