SELECT TOP 1000 [ItemID]
      ,[Path]
      ,[Name]
      ,[ParentID]
      ,[Type]
      ,[Content]
      ,[Intermediate]
      ,[SnapshotDataID]
      ,[LinkSourceID]
      ,[Property]
      ,[Description]
      ,[Hidden]
      ,[CreatedByID]
      ,[CreationDate]
      ,[ModifiedByID]
      ,[ModifiedDate]
      ,[MimeType]
      ,[SnapshotLimit]
      ,[Parameter]
      ,[PolicyID]
      ,[PolicyRoot]
      ,[ExecutionFlag]
      ,[ExecutionTime]
      ,[SubType]
      ,[ComponentID]
  FROM [ReportServer$DBINstanceName].[dbo].[Catalog]

------解决方案--------------------

 ////报表服务器webservice操作类
               ReportingService2010 _rs = new ReportingService2010();          //负责管理服务器的接口
  _rs.Credentials = new System.Net.NetworkCredential(reportViewerUserName, reportViewerPassword, reportViewerDomain);
 _rs.Url = String.Format("{0}/{1}", Common.ReadConfig.ReportServerUrl(), Common.EnumClass.ReportService2010.ToString() + ".asmx");
             
               CatalogItem[] items;
               items = _rs.ListChildren(Common.CommonClass.GetReportFileFolderPath(Common.ReadConfig.ReportProjectName()), true);
               foreach (var item in items)
               {
                   if (item.TypeName == "Report")
                   {
                       sb.Append("<li>");
                       sb.Append("<a href='Report/" + item.Name + "/" + "001' target='_blank'>" + item.Name + "</a>");
                       sb.Append("</li>");
                   }
               }
               this.myReportList.Text = sb.ToString();

自己参考吧，调用的webservice