In this article, the 3-(diethoxymethylsilyl)propyl methacrylate (MPTS) were used as modified functional monomer, acrylic ester and acrylic acid as main monomers, ionic emulsifiers and nonionic emulsifiers as the composite emulsifier, persulfate(KPS) as initiator, and the slicone modified acrylate copolymer emulsion (SAE) was successfully prepared. The relationship between stability of SAE emulsion and contents of MPTS, ?-hydroxypropyl methaerylate (HPMA), initiator and copolymerization temperature were investigated. IR and TG was used to characterize SAE. The SAE copolymer emulsion was applied to prepare the silicones-acrylate copolymer humidity coating (SAE-C) with adding pigments and fillers, such as diatomite, bentonite, etc. Based on measuring the basic performance of copolymer emulsion film and SAE-C coatings, the humidifying function of SAE-C coating was investigated. In conclusion, MPTS could improve the adhesion of SAE film and water resistance of the coating. The results showed that the basic properties of SAE and the SAE-C match the standard for interior wall coatings. The obtained coatings had good humidity-sensitivity and humidity retention, which could be used as the interior walls coating in the building.