Transition metal dichalcogenides (TMD) are layered materials with a strong covalent bond inside the layer and a weak Van der Waals force between the layers. TMD are promising materials for the creation of electronic devices, since they can manifest themselves as a semiconductor, semimetal or metal [1, 2]. It should be noted that the TMD have high mechanical strength and flexibility, as well as unusual electrical, optical and magnetic properties [3]. One such TMD material is tungsten diselenide WSe2.  In this paper, we investigated the generation of terahertz (THz) radiation in a bulk TMD WSe2 and solid solutions Mo0.5W0.5S2 upon irradiation by a linearly polarized laser pulse with the aid of terahertz time-domain spectroscopy.  Spectral characteristics for WSe2 were obtained, where the maximum amplitude is observed at 790 nm and the amplitude of THz radiation increases with increasing wavelength from 730 to 800 nm. Using a fast Fourier transform, a frequency response was obtained, where the spectral width was 3 THz and the spectral width from 730 to 770 nm was reduced. The maximum amplitude was observed at a frequency of 0.71 THz over the entire spectral wavelength range.  Thus, for a solid solution, it was found that the amplitude of the generated THz radiation is an order of magnitude smaller than that of WSe2. The power dependence for the solid solution turned out to be linear, which indicates that the mechanism of THz radiation generation is optical rectification [4]. Since this effect is determined by the interaction between the incident electric field E and the susceptibility to second-order nonlinear media χ. And for WSe2, the generation mechanism will be the Dember photoelectric effect [5].  The authors thank L.L. Kulyuk (Academy of Sciences of Moldova) for providing samples for research.