Abstract: In this paper we discuss(1) the transport of air masses between hemispFieres, and(2) transport between oceans and continents in northern hemisphere. It is found,(1) that the quantity of air mass transport between two hemispheres is much greater than the mass transport between continents and oceans,(2) that generally from January to July the total air mass of northern hemisphere is gradually decreased and the total transport of air in this period to southern hemissphere is about 10.3×1018 grains,(3) that the mass transport between hemisphere is greatest during the period from May to June and from October to November,(4) that the amount of monthly mass transport between two hemispheres is determined by the amount of variation over Eurasian urea, and(5) that the positive deviation from normal of total amount of air mass over Asia accompanies with cold weather while negative deviation accompanies with warm weather over same continent.