The installed wind power capacity in China reaches to 44.733 GW at the end of 2010. Some potential wind power problems occur with the fast development of wind power. In 2011, wind farms consequently disconnected from the local power grid and severely impact the security of power grid. This paper investigates the large-scale wind farm disconnection accidents which happened recently in northwest China. The reasons that cause the accidents are analyzed. The characteristics of wind turbine generator made in China are compared with those made in other countries. The advices of developing wind power are proposed in this paper.