Abstract:     This paper takes the inclined line survey area of 2111(3) working face of Xie Qiao mine in Anhui Province as an example, elevation conversion GPS／level measurement points in the region is realized by plane fitting, surface fitting, multi36 cm, the RMS is about 1.9 cm, the residual value of the checkpoint is 1～3.5 cm, The BP neural network in accordance with the accuracy of up to 1.92 cm and RMS in 1.37 cm, indicating the use of GPS measurement combined with the level of measurement data to fit the elevation anomaly, to calculate the normal high point of each GPS is a line Effective way to meet the needs of general engineering construction.