We consider the functional separation of variables to the nonlinear diffusion equation with source and convection term:ut = (A(x)D(u)ux)x + B(x)Q(u),Ax ≠ 0.The functional separation of variables to this equation is studied by using the group foliation method.A classification is carried out for the equations which admit the function separable solutions.As a consequence,some solutions to the resulting equations are obtained.