The success of the continuous casting process is inseparable from the correct use of the mold powders, but the fluoride volatilization, the contradiction between slag entrapment, heat transfer and lubrication that occurs in the mold restricts the development of green and efficient continuous casting. Through the physical and chemical research of the mold powders in the mold, Chongqing University found that the network formation intermediate elements represented by aluminum in the mold powders have the spectacular effect of adapting to the working environment of the mold:1) inhibit the degree of ion exchange between the slag and the water, and play the role in fixing fluorine and sodium; 2) form a heterogeneous network structure, so that the slag produces obvious shear and thinning behavior, and realizes the viscosity control of the slag in different positions 3) Under the condition of low basicity, it shows obvious thermal diffusion effect, which promotes the glass slag film to become a crystal slag film. On this basis, the design theory of "Smart Mold Powders" for continuous casting is proposed, referred to as "SMP" theory. This theory was used to develop environmentally friendly, non-Newtonian fluids and thermal diffusion effects to mold powders. This type of mold powders can achieve environmental friendliness without fluoride reduction, reduce the rejecting rate of cold-rolled plates and improve the surface quality of slabs for high-nitrogen stainless steel. The "SMP" theory is expected to open up a new way for the development of mold powders to solve environmental problems and the contradictions between slag entrapment, heat transfer and lubrication.