Abstract: There is a large number of critical precipitation standard with different scales of regional landslide early warning, but the models are still exist some problems such as poor extensionality in warning space, low accuracy in warning time and unsuitable critical precipitation threshold. For establishing the landslide early warning model by the critical precipitation threshold, taken as an example of Touzhai gully which is located in Pan River basin, Zhaotong, Yunnan Province, two weather stations in different altitude in the study area are set up respectively. The paper compared characteristics of precipitation of the two different locations based on one year observed data of precipitation. The precipitation of the two positions varies significantly with altitude as the precipitation gradient is up to 190 mm/hm. The difference of the precipitation duration is the main contribution factor of the difference of precipitation between 1# and 2# of this area. The precipitation difference between 1# and 2# are very small when it rains lightly, but it will have 1-2 levels when it rains heavily in 2# and there is 59.26% probability of heavily rainfall. When there is a rainstorm in 1#, the probability of heavy rain and even rainstorm in 2# is 100%. The precipitation at night is greater than during the day in no matter 1# or 2#, most of heavy precipitation events occurred in the night.

Key words: precipitation (rainfall), landslide, Gamma distribution, landslide early warning, temporal and spatial variability of precipitation