The Angle nets data processing, its function model for nonlinear model, for this kind of nonlinear model of the adjustment with problems, the classic indirect adjustment with nonlinear function method will always be in place of approximate parameter according to Taylor polynomial series to an item, ignore a high times, and using the linear model to approximate instead of nonlinear model with linear least square method after obtained the valuations of parameters. Obviously. The linear approximation method of the parameters with approximate requirements the true value deviation smaller, otherwise, the adjustment with the result, to meet the higher accuracy. But with the surveying and mapping the development of science and technology, especially of the 3 S technique is widely used, only stay in linear degree of indirect adjustment methods, to meet the development of science and technology to the corresponding parameter precision requirements, for this reason, many scholars had a lot of a fruitful work, and achieved many the solution method. And nonlinear least squares method of data processing is nonlinear measure the most basic methods.