Found the solution, almost...
Code:
Sub SelectNumberingAndChangeFont()
Dim para As Paragraph
Dim list As list
Dim lvl As ListLevel
Dim lev As ListTemplate
For Each lev In ActiveDocument.ListTemplates
For Each lvl In lev.ListLevels
lvl.Font.Name = "Times New Roman"
Next lvl
Next lev
End Sub
Now the tricky part, it shouldn't changed to Times New Roman for the third-level (third-level should remain SimSun). Using ListIndex returns the index not the level; how to know the level of the list from ListLevels?
Code:
Sub SelectNumberingAndChangeFont()
Dim para As Paragraph
Dim list As list
Dim lvl As ListLevel
Dim lev As ListTemplate
For Each lev In ActiveDocument.ListTemplates
For Each lvl In lev.ListLevels
If lvl.Index <> 3 Then
'If lvl.LevelNumber <> 3 Then
lvl.Font.Name = "Times New Roman"
End If
Next lvl
Next lev
End Sub