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Three directional forging textures and their non-uniformity under different conditions were simulated to explain the formation of forging texture in forged TC18 titanium alloy bars. Firstly, finite element method is used to simulate the non-uniform distributions of temperature, effective stress and effective strain in forged bars. Then the textures in b-phase with BCC structure are simulated using visco-plastic self-consistent model(VPSC) under different initial conditions. Results show that during three directional forging the textures in center region changes more apparently than in edge region. The compressive cube texture {100}<001> and brass type texture {110}<112> generally develop in center region, whereas weak compressive {100} and {111} texture are involved. Initial texture plays important role. By random initial texture, the third step compression often determines the final texture. By weak initial texture the final texture is also weak. In contrast, when strong initial texture exists, three directional forging can’t change its influence with characteristic feature of its initial state. Finally the influences of different combinations of strain amounts in three directions are simulated and special condition for large difference in textures is determined. The texture changes along axial and radical directions are also simulated.