AE的线面相交问题

ISpatialFilter pSpatialFilter = new SpatialFilterClass();
pSpatialFilter.Geometry = pPolyLine;
pSpatialFilter.SpatialRel=ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum.esriSpatialRelIntersects;
IFeatureLayer pFeatureLayer = (IFeatureLayer)DataEditCommon.g_pLayer;
IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;
IFeatureCursor pFeatureCursor = pFeatureLayer.Search(pSpatialFilter, false);
IFeature pFeature = pFeatureCursor.NextFeature();
IPolygon pPolygon = (IPolygon)pFeature.Shape;

主要是第三步我做的是简单的相交查询，但这样当我线段穿过1，2，3这三个面的时候，其实只有2被切割了，但判断出来有3个面相交。请问如何改进，如何只查询到第2个面？求帮助！！