To reveal the effect of trace W addition on the hot workability of the Mn-containing β-solidifying γ-TiAl, the Ti-42Al-5Mn-0.8W alloy (at.%, the same below) were refined with a vacuum induction furnace. Hot deformation behavior of the alloy was studied at the temperature of 1100~1250 ℃, stran rate range of 0.001~10 s-1 and maximum deformation degree of 70% with thermal simulator. It shows that the range of appropriate thermal processing parameters are 1150~1250℃/0.001~10 s-1 and 1100~1145 ℃/0.001~1 s-1. 0.8 at.% W addition can obviously reduce the peak flow stress of Ti-42Al-5Mn alloy(σp) and steady-state flow stress(σ0.7), and the steady-state flow stress decreases more significantly. The main reason why 0.8 at.% W improves the hot workability of Ti-42Al-5Mn alloy is that on the one hand, the W content is relatively small, and the segregation degree of W element is not obvious under the vacuum induction melting mode with strong electromagnetic stirring; On the other hand, thanks to the fact that the β-stabilizing effect of W is stronger than that of Mn, extending the region of β single phase zone, thus having a wider processing window that can be thermally deformed.