Al_0.1CoCrFeNiTi_0.1 high-entropy alloy with FCC/L1₂ two-phase coherence was prepared by vacuum electromagnetic suspension melting (VMIS) method combined with specific heat treatment process and the quasi-static uniaxial constant temperature compression test of the system is carried out in a wide temperature (298K-973K).Observation of the microstructure and morphology of high-entropy alloys by SEM and XRD. At the same time, the lattice parameters and thermodynamic parameters of the FCC solid solution phase and the L1₂ phase nanoprecipitation phase were calculated according to the thermodynamic and crystallographic theories, and the reasons for their formation were explained In addition, the size, spacing and volume fraction of the L1₂ phase within the crystal and at the grain boundary were automatically counted by Image j image processing software. The results show that the ratios of L1₂ phase to FCC phase lattice constant and interplanar spacing are about 1.008 and 0.605, respectively. The average atomic radius of the high-entropy alloy ;the average mixing entropy ;