Abstract: The theoretical analysis about the influence of buoyancy effect caused by density variation and flow acceleration effect on forced convective heat transfer to supercritical fluid was carried out. The analysis results show that buoyancy and acceleration effects may change the turbulent heat and mass transfer through reducing or enhancing the shear stress magnitude at the verge of boundary layer, and make a big difference to supercritical fluid heat transfer at certain conditions. Often buoyancy effect is obvious near the entrance or upstream, while acceleration at where the bulk temperature is just beyond the pseudo-critical temperature. Compared with experimental result, it’s found that the buoyancy and acceleration factors are able to predict the local heat transfer characteristics in the pseudo-critical zone suitably.