用VB生成PDF标签，中文显示问题？急！(请斑竹帮忙)

代码如下：
Set AcroDoc = CreateObject("AcroExch.avdoc")
bdoc = AcroDoc.Open(App.Path & "\1999DGTJZY.pdf", “”)
Set pdDoc = AcroDoc.GetPDDoc
Set jso = pdDoc.GetJSObject

bfound = AcroDoc.FindText("Chapter1", False, False, False)
Set bmRoot = jso.BookMarkRoot

bmRoot.createChild "Test1", "", 1
bmRoot.createChild "Test2", "", 2

children = bmRoot.children
Set bmRchildren = children(0)

bmRchildren.createChild "你好", "this.pageNum = 6", 0
bmRchildren.createChild "Child2", "this.pageNum = 1", 0
bmRchildren.createChild "Child1", "this.pageNum = 0", 0

子标签：“你好”显示不出来
怎么办，是不是编码的问题？？？？？
环境：XP中文简体操作系统
Adobe Acrobat 6.0 Professional 英文版