Abstract:    In this paper, the traditional GPS height fitting methods, such as contour method and analytic fitting method, are introduced for GPS elevation fitting. The Danish method is used to calculate the weight factor for the first time to construct the equivalent weight matrix, and combined with the overall least squares method to resist the influence of the rough point on the GPS elevation fitting results. The results show that the effect of the contour method is equivalent to the other two methods for fitting the equal precision observation data without gross error. Based on the weight factor calculated by Danish method, The deal result of the robust overall least squares method is better in dealing with the accidental error of the unequal accuracy observation data,and the effect of the rough points on the elevation fitting can be effectively dealt by using the weighting factor, and the fitting effect is better.