how to insert paragraph in docx

[MangMax]

I made a template to replace the small features generated when I i want to generate a list of text found that the paragraphs is read-only, can not directly insert a new paragraph, may I ask what method can be achieved in the existing docx to insert a new paragraph, or is it that I am not using the right way!

 private static void ReplaceList(XWPFDocument doc, IReadOnlyDictionary<string, object> data)
        {
            //一定要在 普通文本替换和表格处理之后
            foreach (var p in doc.Paragraphs)
            {
                var li = GetListInfo(p, data);
                if (li.IsList)
                {
                    var pc = li.PTemp;
                    for (var i = 0; i < li.Data.Count; i++)
                    {
                        var pt = p.Copy();
                        doc.Paragraphs.Insert(p.Document.Paragraphs.IndexOf(pc) + 1, pt);
                        pc = li.IsDict ? ReplaceParagraph(pt, (Dictionary<string, object>)li.Data[i]) : ReplaceParagraph(pt, li.Data[i]);
                    }

                    //删除模板行
                    //doc.Paragraphs.Remove(li.PTemp);
                }
                else
                {
                   
                }
            }
        }