A series of post cross-linked acrylic emulsion adhesives were synthesized by pre-emulsion technology and semi-continuous emulsion polymerization. Butyl acrylate (BA), vinyl acetate (VAc) and acrylic acid (AA) were used as main monomers and diacetone-acryloamide (DAAM) /adipic dihydrazide (ADH) as post cross-linker. Emulsion polymer was characterized by means of fourier transform infrared (FTIR) analysis, transmission electron microscopy(TEM) and thermo-gravimetric analysis (TGA). Polymer structures and the cross-linked between emulsion particles have been characterized by FTIR spectroscopy and TEM photographs, respectively. TGA indicated its potential use in the environment of high temperature. Corresponding pressure sensitive adhesive（PSA）tapes were prepared at a thickness of 50 μm, their properties including tack, 180o peel strength, and shear strength at room temperature and 100 oC and their influence by BA:VAc ratio, AA content and DAAM/ADH content were studied. The results showed best properties were obtained when BA:VAc was 85:15 and AA content was 3%. The tack ball size was 17, 180o peel strength was 504 N/m, room temperature shear strength was more than 1 month, and 100 oC shear strength was 140 min. Further introducing of DAAM/ADH significantly improved 100 oC shear strength of the PSA tapes to 540 min at little sacrifice of their tack property and 180o peel strength, which could be explained by the mechanism of post cross-linking.