Abstract: Saline-alkaline dust storm and saline-alkaline mixed dust storm are significant but ignored problems for a long time. After many years' observations and researches,it is observed that the saline-alkaline mixed dust storm play an important role in the earth's history,especially in ecological environmental changes, the main pattern of world desert and human beings' evolution, and all these are based on two characteristics-the huge quantity and the long times' function and influence.The origin or global saline-alkline mixed dust storms are resulted from climate interaction under certain structurae conditions, and may happen once every a few tens of thousands or hundreds of thousands years,so it is easily been ignored. In this papes,we discussed the onigin of saline-alkaline mixed dust storm and its possible influence and impact.It suggests that it may plays a leading role in global desert forming,hominids appearance and the promotion of life evolution.The differences with the traditional sandstorm are also discussed.