The research of the radiowave propagation of microwave in remote sening is mainly on the rules of space distribution and time variance of the brightness temperature and scattering coefficient of the ground objects

and the correlation of the property of the ground objects with the propagation parameters is set up. For the past five years

through reasonable selecting of the number of independent samples by using X-band scatterometer system

we have made the precision of the measurement below 2db. The data of the typical ground objects

which are characteristic of the Chinese topographic features

are extensively collected. These ground objects include waters

roads and airfields with the smooth surface; the farmland

sands and seawave with the rough surface; wheat

rice

grassland and woods with the random surface in the mixed medium; houses

rock and hills with the complex mixed surface. The analysis has some to the important quantitative correlation on the base of experimental results. The research on the relation of the scattering coefficient with the soil moisture and its roughness has been made

and the valuable conclusion has been reached. At the same time

the scattering coefficient and its power spectral density are resolved by using the analysis method about the electromagnetic scattering theory

and these have been compared with the measurement results significantly.