Three types of core／shell latexes which containing epoxy groups in the core layer or on the shell layer and carboxyl groups on the shell layer respectively were synthesized by seeded semiconfinuous emulsion polymerization．Two types of reactive blend latexes were obtained by blending epoxy group functional latex and carboxyl group functional latex．The core／shell morphology of latex particles was clearly observed by TEM．The size and distribution of the emulsion particles were investigated by DLS analysis．The latex particles are narrowly dispersed with polydispersity index of 0．062 and number-average diameter of 76 nm．The diffusion and cross—linking of polymer chains for blend latex particles were investigated by measurement of gel content

swell ratio and FTIR．The influences of different core／shell structure of blend latexes on mechanical properties of the films were described．The results intheate that the polymer chains diffusion and cross—linking reaction are enhanced when the epoxy groups are in the core layer and carboxyl groups in the shell layer of latex particles

as a result

the physical and chemical performance of latexfilms are improved．The tensile strength of blend A film is 20．3 MPa when the glycidyl methacrylate(GMA) content is 10wt％．