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Since the subsurface structure is more complex and there exist an obvious dispersion phenomenon in the near-field of source, the traditional method of cross-positioning exist positioning errors in the shallow position-ing small area, this paper presents a feature-based underground omni-directional sensor distributed underground cross positioning method by P-wave model, underground locating and omni-directional cross globe least squares fit to achieve the precise positioning of the underground source. The research mean that: the RMSE of errors came from underground locating less than 0.5m in the range of 20*20m.