The physical effects in layered MoSe₂ excited by 400 nm short-wavelength pulse are researched by terahertz emission spectroscopy. The dependence of THz amplitude on pump power， azimuthal angle， and polarization angle shows that the THz radiation is mainly caused by the surface depletion field induced photocurrent and the second-order nonlinear polarization induced shift current. The contribution of transient photocurrent and shift current is 82% and 18%， respectively. The results could provide experimental support for the development and application of MoSe₂-based devices in the field of ultra-fast optics.