Abstract. In this paper, we deal with a certain factorable surface in the isotropic 3-space satisfying aK +bH = c, where K is the relative curvature, H the isotropic mean curvature and a, b, c ∈ R. We obtain a complete classification for such surfaces. As a further study, we prove that a certain graph surface with K = H 2 is either a non-isotropic plane or a parabolic sphere.Mathematics Subject Classification (2010): 53A35, 53A40, 53B25.