This research aimed to study the theoretical basis of the pollutant migration to the aquifer and to carry out some experiments concerning the migration of some kinds of pesticides in order to calculate the related coefficients. Hence, the research concentrates on testing the basic methods of migration to the ground waters, finding the physico – chemical reactions between pollutants and aquifer and finding the differential equations which express the movements to the ground waters which can be applied on the experimental data. It also, includes the mechanism study of pollutant migrations through the unsaturated layer is regarded as a passage of the pollutants to the ground waters, and the experimental methods of the calculation of the basic migration coefficient.