The problem of sticking is one of the main challenges of FTSC thin slab continues caster of Tonghua steel， which is caused by the breaking of the slab shell due to the increasing of friction between strand and copper of the mold. On the bases of the processing conditions of Tonghua steel， the composition of molten steel， the performence of fluxes， the parameters of process and the superheat of molten steel were modified. The problem of sticking has been controlled effectively.