Abstract: Dustfall is a important process of weather in the arid zone.However,studies of dustfall can not meet development of environment sciences because of absence of long-term observation in the world.This paper analysed time-space changes of dustfall and brought forward two prediction models.Annual mean dustfall is 4 358 kg/km²,of which dustfall makes up 79.32% in Spring and Summer.In a year the highest dustfall comes forth in May and June which is the transitional period of the season wind in eastern Asia.Particles between 0.07~0.5 mm make up 49.43% of total dustfall and come from near deserts;particles below 0.07 mm count for 50.57% and from a intercontinental scale.

Key words: Dustfall particle-size, Sediment rate, Dust sources, Prediction models