The effects of redispersible polymer powders of ethylene/Vinyl acetate copolymer (EVA) and ethylene/vinyl laurate/vinyl chloride terpolymer (E/VL/VC) on the efflorescence of Portland cement-based decorative mortar (PCBDM) were studied. The results showed that EVA slightly prolongs the efflorescence duration of fresh PCBDM; and exacerbates efflorescence of hardened PCBDM, because it increases the content of soluble salts such as Ca super(2+), K super(+), Na super(+) ions in hardened PCBDM and promotes their migration. E/VL/VC exacerbates efflorescence of fresh PCBDM due to it easily dissolves in the surface water; but reduces efflorescence of hardened PCBDM, which is attributed to that it decreases the soluble salts content in hardened PCBDM and prohibits salts migration.Original Abstract: Straipsnyje tirta disperguojamuju polimeriniu priedu itaka drusku issikristalinimui portlandcemento pagrindu sukurtame dekoratyviniame skiedinyje (CPDM). Eksperimento metu pasirinkti etilen/vinil acetato kopolimero (EVA) ir etilen/vinil laurat/vinil chlorido terpolimero (E/VL/VC) disperguojamieji polimeriniai priedai. Tyrimu rezultatai parode, kad del EVA disperguojamojo polimero siek tiek leciau druskos issikristalizuoja skiedinyje, taciau jos labiau issikristalizuoja sukietejusiame tinke. Siuos tyrimo rezultatus patvirtina sukietejusiame tinke aptikti tirpiu drusku Ca super(2+), K super(+) ir Na super(+) jonai. (E/VL/VC) del lengvai vandens pavirsiuje tirpstanciu disperguojamuju polimenu labiau issikristalizuoja druskos skiedinyje ir leciau susidaro druskines apnasos sukietejusio tinko pavirsiuje. Sis reiskinys aiskinamas tuo, jog aptikta maziau tirpiu drusku sukietejusiame tinke. Del to mazeja drusku migracija dekoratyviniame skiedinyje.