Abstract: As a part of the aerosol, dust will cling to the surface of the foliage when the dust precipitates from aerosol. Just because of the covered dust, when the satellite sensors scanning vegetation canopy, the reflectance data that the sensors obtained will get similar. Even more, the weather changes will make for amount of the dust that covered the leaves increasing or decreasing, for example there is a distinct different between effect of dust before and after raining. So far we still ignore the effect of the dust that covered the leaves’ surface when we process the remote sensing data. As the sensors developed the sensitivity of the sensors to detecting the electromagnetic radiation becomes higher and higher, will the effect of dust not be changed with the development of sensors? We must assess the effect of dust on foliage reflectance anew. In this paper we use ASD FieldSpec to measure winter wheat and Rohdea japonica leaves. First we measure the leaves with dust on their surface, then rush out the dust and measure the leaves again. Compare the two measurements, we find that the dust effect leaves reflectance, and the leaves red edge position doesn’t move.