A novel framework K2Ag6Sn3S10 was synthesized solvothermally and characterized by single-crystal diffraction. The framework comprise (2)(infinity)[Ag6SnS4](2+) cationic layers pillared by (1)(infinity)[SnS3](2-) zigzag chains formed by vertex-sharing SnS4 tetrahedra, and potassium ions are located in 1D channels. This compound crystallizes in the orthorhombic Pbcn space group with a = 24.0201(2) Angstrom, b = 6.4017(3) Angstrom, c = 13.3056(4) Angstrom, Z = 4. Its thermal and optical properties are studied.