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This paper describes the atomization mechanisms and characteristics of a new air-assist micro-atomizer (AMA).The pneumatic twin-fluid micro-atomizers are designed with internal impinging mechanisms and fabricated via MEMS bulk micro-machining processes.Flow visualization and pictures captured by a microscope and a high speed camera are employed to examine the micro jet breakup and atomization processes.Observations of the breakup mechanisms in the near field of the atomizer show that the breakup regimes can be described by the mechanisms involved the laminar jet disintegration, aerodynamic disintegration and turbulent mode based on the atomizing pressure.A new phenomenon of flow branching of the liquid jet emanating from the atomizer was also observed.