The paper based on the data as following: ① the TM

NOAA

FY 1 image data; ② the dust storm data dated from 1951\

1

980; ③ meteorological statistic data dated from 1951\

1

994; ④ soil property; ⑤ land use data. Using the RS/GIS method

all the data are processed to describe the spatial distribution of sand dust storm. The dynamic process of the sand dust storm is analyzed

and the results show that the air circulation of northern China causes the special wind field accompanied with which the sand supplying areas and sand descending areas are identified out. Up to date meteorological satellite data are used to analyze the trajectories of the sand dust storms that have influenced the north China during the spring of 2000

including its out bursting places and moving direction. Also the spatial distribution of sand dust storm from 1951 to 1980 has been analyzed.\ \ The regions that have varied annual total days of sand dust storm are identified out. The results show that from northwest to southeast

the frequency of sand dust storm is decreasing with the most serious area lying to the northwest and west of North China.\;The analysis work of the spatial distribution of main factors that influence the sand supplying of the surface soil are carried out as well as their relation to the frequency distribution of sand dust storm. These factors include the vegetation coverage

soil surface water content

soil property

geomorphologic factor and the land use. Each factor shows high relationship with the frequency distribution of sand dust storm.\;Then the results of remote sensing investigation of wind erosion are analyzed showing that the intensity of wind erosion is decreasing from northwest to southeast with the middle part of Inner Mongolia as the most seriously eroded area. At last

the sand supplying information of the land to the dust storm is revised. The area where the wind intensity strengthens

its frequency of annual dust storm also increases

vice versa. It seems that all these areas are possibly supplying the sand when the sand dust storm happens. There are mainly three routes for the sand dust storm

however the dust storm that has different routes also has varied sand supplying places as pointed out in the paper.