Abstract: Introduction The monitoring system and control strategy of micro-grid has been considered as one of the difficulties to be solved in the micro-grid design process. Method Based on project exssperience, the design method of the micro-gird monitoring system and its control strategy were described in the paper. And then, the functional framework, the network structure and the control strategies of monitoring system in the micro-grid were proposed, at the same time, the paper gave the concrete process of PCC switching strategy. Result Finally, a project example was given in the paper,the network structure and the control strategies of the example were proposed. Conclusion The example shows the effectiveness of the program,it has guiding significance for practical project.