The organic matter and nitrogen concentration of the soil in Changli area of Qin Huangdao were analyzed by the Near Infrared Spectroscopy(NIR).In the preprocessing of the data,the first and second derivatives were used respectively and then the multivariate linear regression was used to confirm the optimal dimension.In data processing,the wavelet analysis was used for the differential spectral data,so the noise was reduced and the precision of analysis was improved.The result has shown that the NIR method is more correlated with the chemical analysis method.