The effect of die forging on the microstructure of metastable β-titanium alloy Ti55511 was investigated by electron backscatter diffraction. Before die forging, the alloy Ti55511 was applied multiple rounds of forging to optimize the microstructural heterogeneity (texture) which can cause mechanical behavior anisotropy of titanium alloys. Different local areas of Ti55511 components after die forging exhibit different microstructures and textures. In all areas with deformation in different degrees, there are not <100> fiber texture form. DRX occurs in area underwent with large strain during the early stage of die forging. Basket-weave microstructure forms in most local areas.