Abstract: Frequency stability is an important guarantee for islanded microgrid, which can ensure it operate safe and steady. In order to improve microgrid dynamic frequency characteristic, this paper represented a virtual inertia control strategy of doubly fed induction generator（DFIG） to increase the amount of microgrid inertia via releasing part of the kinetic energy stored in the rotating rotor, so DFIG can provide a transient frequency support for microgrid. To compensate the decrease of output wind power during the recovery period of the rotor speed, this paper presented the pitch angle control strategy. As a result, the released reserve power caused by decrease of pitch angle can compensate the output power sag, and reduce steady state frequency deviation. This paper combined characteristic of virtual inertial control and pitch angle control of DFIG, and coordinated primary frequency control of diesel generator, consequently islanded microgrid frequency fluctuations caused by load variation can be effectively restrained. Finally, this paper established the microgrid control model include the diesel generator, photovoltaic cell and DFIG, the simulation results showed that this control strategy is valid.