Based on the Maxwell equations and Poyingting vector theoresm, a new thermal design method of magneto-optical (MO) multilayer is presented taking the laser-radiated TbFeCo quadrilayer as an example. Compared with the conventional design method, the new method not only cosideres the practical need of tracking servo, but alse shows great efficiency in calculation. It implies that this method can be used to the structure designing of other multilayers. According to the new designing, a TbFeCo quadrilayer was successfully made using the dc sputturing methed. Corresponding static and moving measurements are carried out, which show good effects of reading and writing.