Reflectance characteristics of canopy and salinity parameters of soil were studied to investigate the relationship of reflectance of above-vegetation and salinity information of soil.The results showed that the maximum of canopy NDVI value presented at booting of rice.Throughout the whole growth stages,the canopy NDVI increased with the decrease of the whole salt,EC of surface soil,especially at booting stage.The NDVI of rice canopy was inversely related to soil Na⁺+K⁺ at jointing,booting and filling stages,except for the regreening stage.The NDVI of rice canopy did not presented significant differences with the increase of soil HCO₃^-,Cl^-,SO₂^4-,Ca²⁺ and Mg>²⁺ at the whole stages.Therefore,the total salt,EC and Na⁺+K⁺ of alkali-saline soil could be accurately predicted through measuring the canopy reflectance of rice from tillering to filling stage.