This paper is to detect the effect of the water cutoff curtain with high-pressure jet grouting piles. Taking the water cutoff curtain with high-pressure jet grouting piles in a project as an example，this study explores the difference in the construction methods of high-pressure jet grouting piles in China and Russia and the detection method of the permeability coefficient of the water cutoff curtain. The “new double-pipe method” is proposed for construction under specific environment and complex conditions. The permeability coefficient K of the high-pressure jet grouting wall is detected by the method of drilling and coring. The construction method and detection calculation formula have the characteristics of strong operability and reliability. The new detection method for the water cutoff effect of jet grouting piles can reflect the overall quality of the high-pressure jet grouting wall，effectively check the permeability coefficient of the high-pressure jet grouting wall，and comprehensively evaluate the effect of the water cutoff curtain.