The energy confinement properties of JT-60 during Ohmic and neutral beam heated discharges are analysed on the basis of the heat pinch model proposed by Callen and Cordey. The feature of temperature profile consistency during variation of the density profile sets an important constraint for the heat pinch term. A heat pinch term proportional to neBp seems to be consistent with the experimental observation. A transport model is proposed which reproduces quite well the parameter dependence of the JT-60 experimental data. The formation of an edge temperature pedestal during the H-mode is observed with this model when the edge convective energy loss is significantly reduced.