To improve saline soil and exploit shallow salt groundwater reasonably，this paper selects the saline soil and shallow groundwater in coastal plains of North China Plains as major research objects． The dynamic characteristics of groundwater level in different drainage methods of the horizontal wells are discussed． Based on the coupling model of the Hydrus －Modflow，the measured data of soil，meteorology are combined with the pumping test in the horizontal well test area． Under natural conditions，the limit-evaporable depth is about 2．5 meters in experiment areas． Single horizontal wells can reduce the groundwater level of 6．67 hm2 arable land over critical water level． And the control range is growing in step with annual pumping capacity by reducing groundwater level to critical groundwater level． Meanwhile，continuous and intermittent drainage measures can reduce the phreatic water level effectively and run the water flux of aeration zone down integrally． As a result，the soil salinization can be controlled validly．