Although previous reports have verified that all 2Hphase group-VIB (in periodic table) TMDs are stable compounds, most of the studies are only focused on Mo-based and W-based dichalcogenides . Recently, CrS 2 is successfully fabricated but the experimental and theoretical understanding of many Cr-based TMD and JTMDs is still lacking. Many of their mechanical properties have not been investigated, in particular elastic-plastic behavior and critical tensile strength. Hence, the understanding of structural deformation and mechanical strength of JTMD CrSSe with its conventional TMD CrS 2 and CrSe 2 is critically important. The success will allow experimentalists to synthesize, characterize, and device these materials.