Hexagonal Bi(Se,S) nanowires (20 nm x 1.5 mu m) were prepared for the first time via a mild solvothermal template reaction of BiCl3 with triphenylphosphine sulfide (TPPS) and elemental Se in ethylenediamine (en) at 120 degrees C for 20 h. In this process, the sulfur source TPPS as a template, the solvent ethylenediamine, and reaction temperature were critical factors of forming hexagonal Bi(Se,S) nanowires.