Magnetic survey is one of the most successful techniques for locating buried unexploded ordnances (UXO)． For the location and identification of buried UXO in Jinshan area，a total- field magnetic survey is ap- plied． The analytic signal of magnetic field is widely used to outline the boundaries of geology bodies，slightly dependent on the magnetization direction． In order to locate the UXO position，the analytic signal is applied to process the magnetic UXO data，which performs better than the conventional magnetic data． Then a typical UXO anomaly is extracted from the original data to invert for its depth by an improved Euler method proposed． The calculated depth is close to the real buried depth．