Spectral data of Soil Iron Oxide（SIO） content and Soil Organic Matter（SOM） content in 253 soil samples from Hunan

Zhejiang and Fujian provinces were analyzed to investigate the effect of SIO content on spectral characteristics and quantification by remote sensing inversion of SOM content.Results showed the following:the characteristic wave band of SIO content ranges from 600 nm to 1400 nm; if SIO content < 20 g / kg

the Spectral Information（SI） of SOM content would not be affected by that of SIO; 20 g/kg < SIO content <30 g/kg

SI in the visible band of SOM content would be influenced; SIO content > 30 g/kg

SI of SIO would cover up that of SOM content.When the ratio of SIO content to SOM content was less than 0.726

SI of SIO content would not affect that of SOM content; when SIO content / SOM content ranged from 1.05 to 2

HI in the range of 400 nm to 1 300 nm band of SOM content would be highly influenced

whereas HI in the range of 1300 nm to 2400 nm would be slightly a ffected;when SIO content / SOM content ratio was more than 2.21

SI of SOM content would be completely covered by that of SIO content.SIO content affected quantificational remote sensing inversion of SOM.The inversion accuracy and stability of p rediction model estimating SOM content decreased with the increase in SIO content or the ratio of SIO content to SOM content.However

SIO content slightly affected quantificational inversion of SOM when SIO content was less than 20 g / kg or SIO content / SOM content was less than 2.0.