Application of automatic solid phase extraction apparatus water enrichment of 20 kinds of semi volatile organic compounds in water. Choose enrichment of C18 solid phase extraction column. Control sample p H 2 or less. Adding suitable amount of sodium chloride increasing ionic strength. Selects the methylene chloride and ethyl acetate as eluent and optimize the solid phase extraction conditions. Using gas chromatography mass spectrometry for qualitative quantitative analysis. The results show that: the linear range is 0.5-5.0 mg/L

detection limit within 0.01-5.7 mu g/L

the correlation coefficient > 0.996

standard addition recovery rate in the range of 28.5%-148.3%

the relative standard deviation（n = 6） were 0.6%-12.5%

effectively implement the mass water samples under automatic extraction process of 20 kinds of semi-volatile organic compounds. The method has good recovery and stability.