Abstract: On the basis of analyzing Luding characteristics of debris flow disasters,and using the history of geological disasters records and historical meteorological data,studying the relation between precipitation and Luding debris flow disaster,it is showed that:1) Luding debris flow disasters in China not only has a wide distribution,high frequency,the harmful heavy wait for a characteristic,and clusters,night hair,periodic characteristics.2) the debris flow occurrence and the relations between the effective rainfall,short-term heavy rainfall,rainfall are close;For six days,the following 36 mm accumulated effective precipitation and accumulation of 8~10 days 49 mm effective rainfall,11~14 days accumulated effective precipitation 101.6 mm above sensitive prophase rainfall condition,the effective accumulative rainfall,increased number of days earlier,the excitation of rainfall,rainfall intensity gradually narrowed,as the rains,hour rainfall intensity,the stronger,the greater the debris flow disasters qualitative change will occur.The current phase of the effective rainfall is not obvious,need strong stimulating rainfall landslides broke out.