I have already known creating sectionview with only one sketchline .The code is as follows:
Dim oPoint2 As Point2d
Set oPoint2 = oapp.TransientGeometry.CreatePoint2d(2, -7)
Dim oPoint3 As Point2d
Set oPoint3 = oapp.TransientGeometry.CreatePoint2d(2, 7)
Dim oPoint4 As Point2d
Set oPoint4 = oapp.TransientGeometry.CreatePoint2d(17.5, 18)
Dim oDrawingSketch As DrawingSketch
Set oDrawingSketch = oView1.Sketches.Add
oDrawingSketch.Edit
Dim oSketchLine As SketchLine
Set oSketchLine = oDrawingSketch.SketchLines.AddByTwoPoints(oPoint2, oPoint3)
oDrawingSketch.ExitEdit
Dim oView2 As SectionDrawingView
Set oView2 = oSheet.DrawingViews.AddSectionView(oView1, oDrawingSketch, oPoint4, kHiddenLineRemovedDrawingViewStyle, , False, " ")
oDrawingSketch.Visible = True
But what I want to do is to create a sectionview with more sketchlines .