Double fed induction generators (DFIG) control method has an important impact on micro-grid operation mode. The micro-grid operating characteristics containing DFIG under master-slave control mode is focused. DFIG control modules including excitation voltage and rotor speed control, pitch angle control, energy storage system control, and electrical load control are studied. And then PQ models of energy storage controller and DFIG controller when grid-connected operation and VF model of main controller when island operation are constructed. Operation characteristics of micro-grid under two modes are simulated based on Matlab platform. Simulation result shows that because of large-scale power grid support, micro-grid has more stable voltage when grid-connected operation; when island operation, load with the same nature has little effect on the operation quality of micro-grid based on DFIG control method, which is mainly determined by the micro-grid control method.