In order to control the quality of irrigation and drainage, save water and land resources and reduce the cost of saline-alkali soil reclamation, it was necessary to design rationally irrigation and drainage engineering technical parameters. The paper proposed a new method to estimate technical parameters of irrigation and drainage engineering for coastal saline-alkali soil reclamation in Tianjin. It was assumed that soil was a homogeneous and isotropic porous medium, and the depth of flooded water on the surface of the land was very small. Under the condition of flooded leaching and draining, the water flow state can be considered two-dimensional steady. Based on Vedernikov infiltration equation, Van der Molen leaching equation and water balance equation, the solution for technical parameters was established. The proposed method was demonstrates through a case on reclamation of coastal saline-alkali soil by leaching and draining, and the results were more consistent with experience values in practical engineering. The research provided guidance for planning and design of saline-alkali soil improvement in Tianjin.%为了控制盐碱土灌排改良质量、节约水土资源和降低改良成本,必须合理规划设计灌排改良工程技术参数.该文系统分析盐碱土灌溉冲洗与排水改良,把暗管排水条件下盐碱土冲洗改良水分运动视为二维稳定流,根据水盐运移特征,运用Vedernikov入渗方程、Van der Molen淋洗方程、水量平衡方程等推求盐碱土灌排工程改良暗管间距、淋洗定额等技术参数,提出了适应滨海新区自然环境的灌排改良工程技术参数估算方法,并通过算例进行了演算；计算值与当前滨海新区盐碱土灌排工程改良采用的经验数据比较接近.研究结果为天津滨海新区盐碱土生态治理规划提供了参考依据.
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