Abstract: After reclamation engineering completed, the structure and layer of reclamation soil is damaged and the soil is easy to become saline-alkali soil. Microwave has the penetrability that provides the possibility to detect the reclamation soil quality. The different degree saline pollution soils under the different water contents by ground penetrating radar were detected, which discover the microwave change law of different salinity pollution. Results show that basic freguency of the antenna which center frequency is 400 MHz change to 250 MHz under salinity pollution. With salinity pollution aggravating, the double peak phenomenon comes forth. Subdominant frequency is 530 MHz. With salinity pollution aggravating, the relative amplitude of subdominant frequency enhanced, and it shows similar phenomena in different water content series. The ground penetrating radar could realize non-destructively investigates the subsurface quickly and widely, so it could provide the changing information in time. It can be used to real-time inspect the reclamation land quality and to control deterioration of reclamation soil as soon as possible.