Abstract: A method of seeking view outline information based on dynamic preferential border is proposed. Angle calculation can be avoided when the correct outline direction at an intersection point with multi-paths is selected. The final choice of candidate path is determined by the location of dynamic square corner point and the center of tangent arcs meeting at the common point. A method of rebuilding the view outline information is presented for generating parametric drawings based on searching traces. The view outline information plays a very important role for automatic partitioning of multi-views, handling the assembly drawings and dimensioning layout etc.