A crylate emulsion modified with C-( methacry late) propy trimethoxy siloxane ( A174) is synthesized with succinic acid based amphoteric emulsifierA1 and nonionic emulsifier CA407. Influences of emulsifier amount,the ratio of Al and CA407 and the irdistributions between seed and pre-emulsion( R/F) E are investigated. Test results show the ra tio o fA 1 and CA407 effect the stability of emulsion polymerization and anti-electrolyte of emulsion. the emulsifier amoun t influenced latexes size and its distribution, polymerization stability, emulsion viscosity and film water absorption, etc. The distribution of emulsifier between seed and pre-emulsionmainly effect the stab ility of po lymerization. Also, we analyse the microstructure of latex by transm ission electronm icroscopy( TEM ) and the glass transition temperature of the film by DSC.