A graphing method is proposed in this paper for estimating parameters of solute transport in soils based on the convection-dispersion equation (CDE).The ratio of flux concentration changing with the time (dc/dt) is obtained on data of breakthrough curves (BTCs) of solute transport in a semiinfinite soil column.Using graphing software,for example,the Microsoft Excel,can draw two curves of t^1.5 dc/dt and dc/dt in respect to time.Each curve has a single peak.The two curves are used to estimate the retardation factor (R) and dispersion coefficient (D₀) in the CDE.Hypothetical examples and displacement experimental data of the two soils were used to validate the new graphing method for its accuracy and stability of the estimation of the two parameters.The stability of parameter estimation is evaluated by the standard deviations of est imated parameters against their average value.The accuracy of the new method is assessed by comparing it with other two most used methods that are the CXTFIT and the equal-slope method.The results show that the method high both in accuracy and in stability.The new method is particularly good for est imating parameter R.The method is a deterministic method and it is simple in terms of calculation.It also has the advantages of uniqueness and no initial guess of parameters over the CXTFIT method.The new method provides an alternative approach to estimating parameters of solute transport in soils.It is simple,accurate,stable,and saves time.