MicroBooNE is a neutrino experiment based on the technology of liquid argon time projection chamber (LAr TPC). It has recently come online in the Fermilab Booster Neutrino Beam, aiming to address the anomalous excess of events with an electromagnetic final state in MiniBooNE. Being the first large LAr TPC in the US, it will also measure the neutrino-Ar cross sections and provide important R&D for future detectors. In this talk, I will briefly introduce the physics goals of the MicroBooNE experiment, outline the technology and detector performance, and discuss the reconstruction strategies as well as the first analyses.