全部选中---选择边框---线性（小三角）---根据自己的需求选择不同类型的线，和不容粗细的线
几千条，用宏：
Sub test()
For Each ichart In ActiveSheet.ChartObjects
ichart.Activate
ActiveChart.SeriesCollection(1).Select
With Selection.Border
.Weight = xlThick '变为粗线
.LineStyle = xlContinuous
End With
Next
End Sub
Sub x()
For i = 1 To 121
ActiveChart.SeriesCollection(i).Select
Selection.MarkerSize = 4
Selection.Format.Line.Weight = 0.25
Next
End Sub
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