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The effect of die forging on the microstructure evolution and deformation behavior of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction. Before die forging, the alloy Ti55511 was subjected to multi-pass forging to optimize the microstructural heterogeneity (texture) which can cause mechanical behavior anisotropy of titanium alloys. Results show that after die forging, Ti55511 components exhibit different microstructures and textures in different local areas. No <100> fiber texture is found in all areas with different degrees of deformation. Dynamic recrystallization occurs in the area where large strain occurs during the early stage of die forging. Basket-weave microstructure forms in most local areas.