Hypoeutectic FCC/B2 dual-phase high-entropy alloys often suffer from microstructural heterogeneity and deformation incompatibility between their constituent phases at elevated temperatures, making it difficult to balance strength and ductility. In this work, cold-rolling pre-strain followed by intermediate-temperature aging was applied to a Ni60Cr10Fe9.9- Al18Mo2C0.1 hypoeutectic high-entropy alloy to investigate its aging response, L12 precipitation behavior, and tensile properties at 800 ℃.Both the 15% and 30% pre-strained samples show pronounced age-hardening responses at 700 ℃, with the 30% pre-strained sample reaching a higher peak hardness. TEM results confirmed the formation of L12 ordered precipitates in the FCC matrix after pre-strain aging. The average size of the L12 precipitates is (9.17±0.13) nm in the 15% pre-strain-aged alloy, whereas it increases markedly to (44.60±0.43) nm in the 30% pre-strain-aged alloy. Tensile tests at 800 ℃ reveals that pre-strain aging increases the yield strength but substantially reduces the elongation. The 15% pre-strain-aged alloy has a yield strength of approximately 743 MPa, but its elongation decreases to approximately 4.7%. When the pre-strain is increased to 30% , the further strength improvement is limited, whereas the elongation further decreases to approximately 1.5% . Fracture analysis indicates that strengthening of the FCC matrix reduces its