Considering the specific situation of precipitation, runoff, infiltration and rainstorm on the Loess Plateau and the need for collecting rainstorm data, the authors analyzed the necessity and idea drafting the criterion of long duration <60-1440min) rainstorm for soil erosion, According to the idea and the short duration criterion drafted in the past, the criterion on long duration rainstorm for soil erosion with rcfrence to related information was drafted.