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This paper presents a basic rule of making network bus ordering for state estimation by taking into consideration both circuit topology and measurement set information. In order to unify these two different kinds of reference information, measurement information is translated into its topological equivalent and annexed to the system topology representation. Therefore, the ordering can be done by referring only to the modified network topology information. The translation rule is found through the investigation of the topological property of the coefficient matrix of a normal equation in state estimation calculation.