The present invention provides a method for producing a plasma display panel for restraining depression phenomenon of slit coating method, and forming a protective layer by using raw materials withoutpolymer. The method is characterized in that the formation of the protective layer comprises the steps of: (i) forming a first protective layer by sputtering or vapor deposition process on a dielectric layer of a substrate; (ii) applying a MgO material onto the first protective layer to form a MgO material layer; and (iii) drying the Mgo material layer so as to form a second protective layer therefrom, wherein the MgO material comprises a MgO powder, a solvent A and a solvent B; a vapor pressure of the solvent A is higher than and equal to 50 Pa at 20 DEG C.; a vapor pressure of the solventB is lower than and equal to 7 Pa at 20 DEG C.; and a proportion of the solvent B to all solvents contained in the MgO material is higher than and equal to 3% by weight.