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The spinodal decomposition of the ␤ Ti-Cr binary alloys system is still questionable, because there are only rare experimental and thermodynamics data; moreover, simulation results for a real alloy system have not been found. Transmission electron microscopy (TEM) and quantitative computer simulations based on Khachaturyan's diffusion equation have been employed to study the microstructural evolution occurring in the metastable ␤ Ti-Cr alloys. Our study results reveal that the metastable ␤ Ti-Cr undergoes a phase separation reaction ␤ → titanium rich (␤ 1 ) ϩ chromium rich (␤ 2 ) through a spinodal decomposition. The coherent two-phase fields show extremely fine platelike precipitates distributed homogenously through the bcc matrix, which are parallel to the {100} plane. Those precipitates are highly elastic induced from the first step of the phase separation. There is good agreement between the observed microstructure and the simulation results. The mode of formation of ␣ phase is also discussed.