The benefical conditions that debris flow is formed in Sanchahe valley along Du-ku highway of Tianshan mountains are frequent rainstorm,exposed rock and high and precipitous land form in alpine region of the drainage basin. Sustained high air temperature in summer can lead to ice-fall of glacier at backwall of the basin.Then,the ice-fall is melted qulkly and results in formation of glacier flood which the debris flow is simulated.Because the conditions mentioned above are still exist,debris flow at present,is in an active period