Abstract: Based on a large number of loess sample test of dynamic parameters,and combined with the research and identification results of over 60 typical landslip hazards happened in loess,a new theory and new formula of space predicting of loess landslip are put forward.The condition of slide,the distinguish feature of loess and the spark factors of landslip mass are considered in the theory.This formula is used to predict and simulate the space of many loss landslip.