Abstract:A method for space-domain potential field conversion based on spline function is advanced here. It includes the following essential points.The basic formula for potential field continuation is used to construct first type of weak oddness integral equation. This integral equation is solved to have normal derivative of boundary potential field. The integral expression is evaluated then. The method matches the inversion based on spline function to form a system for potential field conversion. Modeling computation and real processing result show that the method is characterized by simple principle, high accuracy,and slight influence due to terrainslope. It is thus a new way in this realm.