We have calculated the longitudinal acoustic phonon limited electron mobility of 14 two-dimensional semiconductors with composition of MX₂, where M (= Mo, W, Sn, Hf, Zr and Pt) is the transition metal, and X is S, Se and Te. We treated the scattering matrix by the deformation potential approximation. We found that out of 14 compounds, MoTe₂, HfSe₂ and ZrSe₂ are promising regarding to their possible high mobility and finite band gap. The phonon limited mobility can be above 2, 500 cm²·V^-1·s^-1 at room temperature.