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With the accelerated development of distributed generation (DG) technology, more and more scholars pay attention to micro-grid (MG). In the early decades, focus was put only on basic technologies. But in recent years, many new methods are being applied in this area, such as artificial intelligence, PSO (particle swarm optimization), interval-based MADM (multi-attribute decision making) using tradeoff analysis. Furthermore, the penetration of DG would influence the existing power market or other former rules of the power system. After reading plenty of publications, in this work we summarize the existed methods already put forward, and discuss some possible solutions that may well settle the following issues. a)power quality and stability; b) protection; c)power balance control policy; d) MG grid programming and economic operation.