代码和模板都没问题。

加入代码弹出内容看一下 msgbox("<出差起日期 >= #" & qr & "# And 出差止时期 <= #" & zr & "#>" )

对应的，对表格筛选，看筛选结果是什么 Tables("蒋安出差").filter = "出差起日期 >= #" & qr & "# And 出差止时期 <= #" & zr & "#"

你1楼的代码是没问题的。如果打印为空，说明你没有把表数据加载出来。

或者试试

If  Forms("出差打印").Opened = True Then
    Dim qr As Date = e.Form.Controls("qr").value
    Dim zr As Date = e.Form.Controls("zr").value
    If qr <> Nothing And zr  <>  Nothing Then
        If zr >= qr Then
            systemready = False
            Dim filter As String  =  "出差起日期 >= #" & qr & "# And 出差止日期 <= #" & zr & "#"  \' "出差起日期 >= #12-1-2018# And 出差起日期 <= #12-30-2018#"
            DataTables("蒋安出差").LoadFilter = filter
            DataTables("蒋安出差").Load
            Dim Book As New XLS.Book(ProjectPath & "Attachments\\公务用车记录单.xls") \'打开模板
            Dim fl As String = ProjectPath & "Reports\\123.xls"
            Dim Sheet As XLS.Sheet = Book.Sheets(0)
            Sheet(4,9).Value = "< " & filter & " >"
            Book.Build() \'生成报表
            Book.Save(fl)
            Dim Proc As New Process
            Proc.File = fl
            Proc.Start()
            systemready = True
        End If
    End If
End If