Abstract: Because of the measuring errors, the soil parameters that are back analyzed by the measuring valuesare sometimes unreliable. This paper analyzes all sorts of the measuring errors in an embankment project, anddiscusses how to determine these errors. A minimum objective function including covariance matrix is derived by the maximum likelihood method. The soil parameters can be back analyzed when the minimum objective function becomes the fitness function of Genetic Algorithm. By analyzing an embankment, the results considering the measuring errors of inclinometer are more reliable than those not considering the errors.