Based on the NCEP/DOE reanalysis data from 1979 to 2012, the intraseasonal oscillation characteristics of the winter geopotential height in Northern Hemisphere were analyzed. Results show that:the intraseasonal variation strength is stronger in the upper-troposphere than that in the lower troposphere; the maximum variability appears over the Atlantic and the Pacific; in the upper troposphere, the geopotential height presents 1 to 3 waves with the obvious intraseasonal oscillation (ISO) characteristics (10-60 day oscillation);the intraseasonal oscillations (10-60 day filtered) propagate westward;the ISO of the geopotential height in the upper troposphere influences the Asian winter monsoon systems, such as Mongolia high and probably leads to the air temperature anomaly in the monsoon areas to maintain for a long time.