This paper presents the simulation of heat transfer processing in conjugate food freezing/air force convection inside a freezing device by CFD method. Base on concept of effective specific heat, modelling of heat conduction with heat generation inside foodstuff, which generates by phase chance from liquid to solid of water contend, will be transferred to modelling of heat conduction with thermal properties depend on temperature. Application of turbulent flow model kE, the mechanical air flow and the convection between air flow and foodstuff on the suface will be solved. These processings will be coupling simulated by simulation software Fluent 12.0. The comparing between the calculated result in temperature field inside foodstuff by this modelling and the experimental result showed the accuracy of this modelling.