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The general definition and operational characteristics of distributed generations (DGs) and micro-grid are summarized in this paper. Three technical requirements are proposed to achieve the most reliable interconnection between micro-grid and the external grid. A typical analysis model of micro-grid containing wind power generation and photovoltaic generation is built and simulated based on EMTDC/PSCAD. Through simulation the general requirements of reliability between the micro-grid and the external grid is tested and verified. Other particular requirements that contribute in the reliable interconnection between micro-grid and the external grid in terms of power electronic device, power quality, relay protection and control strategy, etc, are also obtained in this paper. The conclusions gave in this paper are available for the reference on achieving reliable interconnection between the micro-grid and external grid.