High strength TC4 titanium alloy plate was produced successfully by multi-pass warm rolling（two-direction rolling+single direction rolling）.Mechanical properties and microstructure of as-multipass rolled and as-unidirection rolled TC4 titanium alloy were analyzed comparatively.The results show that the multi-pass rolling can refine significantly the grain size with dispersed distribution of nanoscale equiaxedαphase

and along the rolling direction

a small amount of the chain and filamentousαphase can be observed.Matrixβphase is broken

and micro-sizeβgrain is parallel to the rolling direction

showing a certain degree of orientation

with dispersed distribution of the sub-micron-sizeβgrain.The room temperature mechanical properties of TC4 titanium alloy were improved significantly after multipass rolling.In addition

the anisotropy of mechanical properties is relieved

and the difference in tensile strength and elongation between the rolling direction and transverse direction is decreased greatly.