Abstract: The paper deals with the effects on the adjusted results by using different adjustment models. Based on this theory, it gives a criterion of the selection and rejection of dynamic parameters:the smaller the estimator of unit weight variance factor σ₀², the better the model. Then, by using the scan calculation technique, some unnecessary parameters are sifted out from the dynamic adjustment of leveling networks. In addition, the method have been applied to test calculation of leveling networks in some regioes. Compared with the former dynamic adjustment, the new method is more suitable to divide the points in the field into two kinds:stable points and dynamic points.