Short time strong precipitation that appears in Huhhot in continuous two days from 25 to 26 July 2012 was analyzed from circulation background and happening condition and etc by using conventional observation data and non-conventional materials.The results show that: (1) These two processes occur in the circulation of ‘high east and low west’. West Pacific subtropical high and Baikal low are stable maintained, which is favorable for the cold and warm air meets for a long time. (2) The joint action and configuration of the middle-low latitude weather system, the up-down stream system, high-low level and multi-scale system have contribute to this event, among these the meso-small scale system is the main reason of strong precipitation, but the location of main influence system and characteristics of producing factors are different. (3) The whole level humidity condition is better and located in warm region, but convection is relatively weak in the first day; in a while in the second day, convective instability stratification structure appears because of atmospheric stratification of dry and cold in the up and warm and humid in the low, so the convection is comparably strong. (4) These two days' strong precipitation is both the stratiform clouds and convective clouds induced comprehensive precipitation, but the horizontal and vertical scale of first event is larger; in a while convective precipitation happens mainly in the second. (5) From radar data, the reflectivity factor, vertical integrated liquid water content and echo top of the first day are weaker than the second day; there exists a low level jet seen from radical velocity chart; strong reflectivity area appears wide and flake shape can be seen from reflectivity factor, moves toward northeast and expand southward in the first day; while appears narrow range and band shape, moves eastward and expands southward, appears a obvious train effect in the second day. (6) These two days precipitation occurs in the central of Huhhot region which located in the south of Daqing mountain and in the west of Manhan Mountain, so the topography induced updraft motion plays critical role in the process.
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