Abstract: The experiment has taken a typical structure model as experimental tablet to test the heat transfer characteristic of the porous lamellar tablet.Research on the changing regulation of the cooling effectiveness of the porous lamellar tablet with the blowing ratio of the hot and cooling flow has been done.Furthermore,careful research on the cooling effectiveness of internal layer along the axis downstream has been performed.The mathematics fit formula of the partial Nu x and the cooling effectiveness E with respect to partial Rex and the blowing ratio M of the hot and cooling flow has been given.