Ti-55531 alloy with the acicular α initial microstructure was hot rolled at 750_^oC. The anisotropy of ductility and ultimate tensile properties of Ti-55531 near β alloy rolled plate were studied by analyzing microstructures and macrotextures. The results show that the acicular α phases in the Ti-55531 alloy rolled plate are perpendicular to the direction of the force, and significant α macrotextures are appears. Due to the specific orientation of α phase morphology, the crack propagation resistance along rolling direction (RD) is higher than that along transverse direction (TD), which resulting in better ductility in RD. Macrotextures lead to obvious differences in the action of slip systems and twins along RD and TD, which results in higher ultimate tensile strength along TD.