Abstract: Three exothermic modes: the given wall temperature mode, the boiling heat transfer mode and the adiabatic mode, were analyzed for calculating cooling water vaporization rate of coke layer with middle channel structure in coking tower by temperature field calculating program using Visual Basic, assuming the coke layer cooling heat being equal to the cooling water vaporization heat. And the results compared with the site operation data indicate that a large deviation is observed for adiabatic mode. While for other two modes, the analyzed results are close to the site operation data.