The　kinetics　of　acrylates　copolymerization　initiated　with　azobisisobutyronitrile　(AIBN)　in　inverse　microemulsions　composed　of　methyl　methacrylate　(MMA)　-butyl　acrylate　(BA)/dodecyl　sodium　sulfate　(SDS)　-acrylic　acid　(AA)/water　was　studied.　The　results　showed　that　the　apparent　polymerization　rate　at　5%　conversion　increased　with　increased　AIBN　concentration,　AA　concentration,　aqueous　fraction　and　reaction　temperature　while　decreased　with　increased　SDS　concentration,　and　the　kinetic　relation　was　obtained.　Nucleation　in　aqueous　droplet　was　considered　to　be　important.　Furthermore,　the　total　apparent　activation　energy　was　found　to　be　114　kJ·mol-1.