Jiuquan Wind Power Base（JQWPB） is the first 10 GW-level pilot wind power base in the world， whose construction is the first successful attempt to exploit wind energy in large scale and far away from the load center. By using the gauged wind resources data and the recent energy management system（EMS） operating data from the dispatching department， an analysis is made of the characteristics of wind power resources， and investigations are performed on the power characteristics of wind turbine generator， wind farm， wind farm cluster and the entire JQWPB. By comparing the wind power characteristics in different time scales， it has been found that the output power of the JQWPB has clear relevance to long time scale and is obviously complementary for short time scale. Also treated is the effect of wind power characteristics on power grid stability， peak load regulation and frequency control.