This paper has conducted a sPn phase analysis of earthquakes (M ≥3.0) in Anhui Province and its adjacent area using characteristics of depth phase sPn and waveform data of Anhui digital seismic network from 2008 to 2012. And the results of focal depth calculated by sPn phases are contrasted with simplex method widely used in seismic networks and positioning results issued by national authority seismological agency. The results show that it helps to correct positioning accuracy of station network by measuring near-field earthquake depth using sPn-Pn wave of near-field seismic phase, which is also of great significance in accurate calculation of seismic source parameters and earthquake damage ratings.