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To promote the performance of RTKLIB software in processing the transformation from the Cartesian coordinates to geodetic coordinate, this paper proposed an algorithm based on the Newton iterative algorithm extended out from the Bowring's method. By theoretical analysis and experimental test data contrast, it has been demonstrated that comparing with the general iterative coordinate transformation algorithm existing in RTKLIB, the proposed extended iterative coordinate transformation algorithm has the characteristics of less iteration times and higher accuracy and is more suitable for the situation when the value of height coordinates (h) is large.