The energy efficiency of the microwave-assis¬ted synthesis of 2-2-phenylethenyl]-2,3-dihydro-1H-benzimidazole and its derivatives are an important class of heterocyclic compounds , that exhibit a wide range of biological and pharmacological activities. Synthetic Imidazole are present in many fungicides, analgesic, anti-inflammatory, antibacterial, antitumor activities . Synthesis of imidazole and their derivatives by using microwave technique . This reaction is carried by adopting one pot multi-component reaction method . The synthesized compound have been characterised by IR , H1NMR , U.V- visible spectral data and elemental analysis . The synthesised compound screened for antimicrobial activity. Some compound showed significant antimicrobial activity.