Abstract: The paper introduces the relationship among transformation parameters, form parameters and barycentralization parameters in local and national coordinates.And, it is the first time to present the possibility of obtaining the barycentralization model of the least squares of transformation parameters without arranging the error or normal equation.Then, the parameter formula with specific geometric significance is derived based on calculation of barycentralization parameters.The practical calculation proves the correctness of the model mentioned herein.

Key words: Local coordinates, National coordinates, Transformation parameters, Form parameters, Barycentralization parameters