RNG(renormalization group) k-ε turbulent model combined with Wolfstein one-equation model in the vicinity of the wall was used to calculate the convective heat transfer properties of Daqing RP-3 aviation kerosene in a horizontal pipe at a supercritical pressure.A significant secondary flow was generated by the buoyancy effect due to the dramatic changes of the thermophysical properties of the kerosene near the pseudo-critical point.The secondary flow enhanced the turbulence intensity and convective heat transfer on the bottom of the pipe,and reduced the turbulence intensity and heat transfer on the top.Finally,the applicability of two criteria,used for the buoyancy effect on the convective heat transfer of horizontal pipes,was analyzed and compared at the supercritical conditions.