Abstract: Laowan gold mineralization belt is located at the north of Tongbai Mountain，the eastern part of east-west trending Qinling tectonic belt，and between Nanyang Basin and Wucheng Basin.It belongs to the mesothermal-epithermal gold deposit of alteration rock type.In recent years，great progress has been made in prospecting for gold in this region，with the amount of newly added gold resources exceeding 150 t.In order to expand prospecting results，the analysis of primary halo characteristics of No.Ⅱ-2-2 orebody was made，and the research of the related characteristics of ore-forming elements by correlation analysis，cluster analysis and factor analysis was carried out. Based on this study，the geochemical signs for prospecting were made and the concealed god orebodies were predicted.The research achievements have been obtained as follows:①the axial zoning sequence of orebodies can be described as Ag→Zn→Hg→As→Au→Sb→Bi→Pb→Cu→Mo→W→Sn.The near-ore hole elements Ag and Zn is before the head hole elements Hg，and As and Sb，the rear halo element Bi is before Pb and Cu.It may indicate that concealed orebodies are below -737 m；②Mo，Bi，Cu and S are strongly related to Au，and geochemical anomalies of such elements can be used as signs for gold prospecting in this region；③the ratios of elemental zoning index show that the head hole of the lower orebody is superimposed with the near-ore halo of the upper orebody，the contour of F2 factor score are abnormally developed and not closed in depth.It may indicate that the region below -740 m has good potential for prospecting.Based on the above analysis results，it is predicted that the target district is below -740 m in the south of ZKE608 drilling in exploration line E6.Drilling engineering were arranged in the south of ZKE608 drilling in exploration line E6 for verification，and the gold mineralized body whose real thickness is 1.08 m was found at the elevation from -794.18 m to -795.53 m，which further show that the prediction methods and prediction results in this paper are reliable and can provide reliable reference for the further deep prospecting work in the area.

Key words: Deep prospecting, Laowan gold mineralization belt, Primary halo, Geochemical characteristics, Zoning index, Concealed orebody