Abstract: In the study of the aeolian sand saltation, the interactions between the wind and the sand particles are the key. Both the macro-sized unsteady feature and the micro-sized high frequent turbulence prevalent simultaneously in the field gust would lead to the fluctuant sand-transport rate and the intermittent saltation process in the wind-sand flow. While the time-averaged wind velocity is used to analyze the natural wind-sand flow, the high unsteady feature and the turbulent intensity in the flow would cause huge errors. It may be the reason why the results derived from the field observation, the wind-tunnel experiment and the numerical simulation have great deviations. The sand saltation within the wild gust field is an important research issue. Unfortunately, there are few reliable instantaneous measurements on the whole flow field to validate the related mathematical model. The development of the whole field measurement with high frequency in the wind-sand flow and the simulation technique of the field gust in the wind tunnel would solve this problem.