Through theoretic calculation and field irrigation experiment, the deposition and dissolution of CaCO₃ and MgCO₃, of soil and the adsorption and desorption of ions in mineralized irrigation water-soil system were studied in this work. A calculating method of △G_CaCO3 and △G_MgCO3, for judging the deposition and dissolution equilibria of CaCO₃ and MgCO₃ was established according to the theory of electrolyte solution. The measured results in field experiment confirm to the theoretic calculating results of △G_CaCO3, and △G_MgCO3, of different icligation water. The solubility of CaCO₃ and MgCO₃ of soil was increased due to salt effect of mineralized irrigation water. The soluble calcium and magnesium contents of soil increased after the soil was irrigated with mineralized water. Planting reduces the K value of sodium adsorption Gapon equation and decreases the adsorption of sodium from irrigation water by soil in field condition.