Porous media are widely present in nature. Soil and aquifer are complex porous media, in which multiple physical, chemical and biological processes for contaminants can occur. This course focuses on the basic theory of seepage and pollutant migration inporous media, and introduces the multi-media, multi-process, multi-component, multi-phase flow , multi-interface, multi-scale characteristics and multi-field coupling characteristics of environmental media. The content includes basic law of seepage flow in porous media;  contaminant transport model, the physical process of contaminant transport processes, including convection, dispersion and adsorption processes, chemical processes and biodegradation processes. The basic differential equation of contaminant transport in porous media, the chain decay of solid-liquid interaction, the general equation of multiphase and multi-component contaminant transport processes in porous media, density-varible equation, are introduced. The migration and distribution of pollutants in the process of surface water-groundwater interaction are introduced. Through the study of this course, students can understand the basic theory of  seepage and contaminant transport in porous media, obtain the approaches of quantitative analysis, and improve their scientific research ability.