In this study we investigated the atmospheric water circulation patterns over Mongolia, we focus on the Khangai mountainous region. The annual average surface air pressure around 780-930 hPa over Mongolia, and 780-870 hPa over the Khangai mountainous region, and the annual average air temperature around -9 oC to -24 oC over Mongolia, and -12 oC to -21 oC over the Khangai mountainous region, at the 780-810 hPa. The Khangai mountainous region, there are dominated radical-continental climatic conditions with variance of temperature high-4 seasons including long and cold winter, short and dry summer, generally colder than other regions of the same latitude because of the high altitude (the average elevation is 2000 m above sea level). In northern site of the Khangai mountainous region there were steadied dominated arctic cyclonic in winter time, annual average wind speed is 7-10 m/sec, and in spring time were steadied dominated anticyclonic specially, southern site of the Khangai mountainous region, investigated period of time since 1979 to 2016. Then we estimated annual average horizontal and meridional column integrated annual and seasonal (June, July, August) moisture flux convergence. The atmospheric moisture fluxes were vertically integrated at the 850 hPa at the atmosphere, to set reanalysis model field, after which the convergence was calculated, the annual average precipitable water was 0-3 mm/day, and precipitation was -1 to 3 mm over Mongolia, and the precipitable water and precipitation was 2-3 mm/day over the Khangai mountainous region. The annual variability of summer precipitation and summer moisture flux convergence it has corresponds to precipitation over the Khangai mountainous region.
