The invention is a mixed stucco block of gypsum blocks. Due to using a layer of compacted polystyrene in its center, it is much lighter than regular gypsum blocks. In addition, its heat transfer coefficient is less than solid stucco panels. In addition, due to applying some smithereens in it along with support system and innovative Rabyts, mechanical connection of cement mortar is provided for it. Therefore it is possible to use this block in wet places including in bathroom, WC, and as the side wall of the façade.