The paper presents the results of discrimination and classification of Three North shelter forests using shuttle imaging radar (SIR-C/X-SAR) data in Yichuan count

Shannxi province. The forest is divided into three types: coniferous

deciduous and mixed forest. The backscatter coefficients of three forest types are extracted from\nthe SIR-C/X-SAR data

and the effect of the forest types discrimination is analyzed using multifrequency and multipolarization.