RADARSAT 2 is used to estimate forest parameter. The study site is in Zhazuo forestry centre, Guizhou province,
China, where are mainly conifer species. Semi-empirical Water Cloud Model was used to estimate Leaf Area Index
(LAI). The result proved that using Water Cloud Model to estimate LAI is feasible. We use classical scatter model to
analyze the relationship between Tree Height and backscattering coefficients of different polarization mode or different
combinations of polarizations. And found that HH polarization is relatively sensitive to Tree Height, however, their
correlation is less than 0.6. It is shown that directly establish relations of backscattering coefficient or different
polarization combination and tree height to inverse LAI is not a desirable method.