Eutectic high-entropy alloys (EHEAs) have garnered extensive attention in the field of materials science because of their excellent mechanical properties and superior castability. Among them, C-containing eutectic high-entropy alloys represent a novel design system developed in recent years. Although they exhibit good plasticity, their low yield strength  remains a bottleneck that restricts their engineering applications. To address the insufficient strength of carbon-containing eutectic high-entropy alloys, an FCC+M4C3-type CoFeNi2(V2.5C)0.2 eutectic high-entropy alloy was utilized as the matrix. By adding Al to alter the solidification path, an Al0.3CoFeNi2(V2.5C)0.2 hypereutectic high-entropy alloy was designed and fabricated. The alloy consists of a primary M4C3 carbide phase and an FCC solid solution phase. While essentially unchanged elongation (10.7%±1.1%) is maintained, the yield strength and tensile strength increases by 37% and 21%, reaching (482 ±22) MPa and (918 ±27) MPa, respectively. Through classical strengthening models combined with microstructural characterization (SEM, XRD, EBSD), the strengthening and toughening mechanisms are elucidated: the strength enhancement primarily originates from the solid solution strengthening effect of Al and the precipitation strengthening from the primary carbides, which enhances the work hardening rate, delays plastic instability, and achieves a

synergistic improvement in strength and ductility.