問題通常由圖層設(shè)置、視口顯示、線型比例或圖形刷新引起。1.檢查圖層是否關(guān)閉或凍結(jié)，確認顏色與背景不同；2.在視口內(nèi)使用ZOOM EXTENTS確保幾何體在可視范圍內(nèi)；3.調(diào)整LTSCALE值以修復(fù)線型比例異常；4.檢查打印樣式表中是否存在顏色輸出限制；5.嘗試REGEN命令或切換視覺樣式解決圖形渲染問題。按照順序排查即可快速定位原因。

If you're working in AutoCAD and notice that your lines aren't showing up, it can be frustrating—especially if you know they should be there. The issue is more common than you might think, and usually has a straightforward explanation. Let's break down some of the most likely causes and what you can do to fix them.

Layer Settings Might Be Hiding Your Lines

One of the most frequent reasons lines don’t appear is because of layer settings. In AutoCAD, everything lives on a layer, and layers can be turned off, frozen, or set to not display objects.

• Check the Layer Properties Manager (type LAYER or click the Layers panel).
• Look for the layer your lines are on—make sure it’s not turned off (lightbulb icon) or frozen (snowflake icon).
• Also, verify that the color assigned to the layer isn’t matching your background. If your drawing background is black and your layer color is also black, lines will be invisible.

Sometimes, people place geometry on the wrong layer by accident. Double-check which layer is current when you draw, or use the PROPERTIES command to see what layer selected objects are on.

Viewport Display or Zoom Extents Could Be Throwing You Off

Another common situation happens in paper space viewports. If you’re looking through a viewport and your lines are outside the visible area, they won’t show up—even if they exist in model space.

• Double-click inside the viewport and type ZOOM EXTENTS. This will zoom to all geometry in that viewport.
• Alternatively, right-click the viewport boundary and choose “Display Locked” – make sure it’s off, or it might be locking an old view.

Also, sometimes when you draw very small lines or at a large coordinate distance from the origin, they may not be visible until you pan or zoom in properly. Use ZOOM ALL to see everything in your current space.

Plot Style or Linetype Issues Can Make Lines Disappear

Believe it or not, linetypes and plot styles can affect visibility even on screen.

• Type LTSCALE or LTS and try adjusting the value. If your linetype scale is too high or too low, dashed lines might look like they’re missing—they’re actually just scaled incorrectly.
• If you're using a plot style table (like a .ctb file), certain colors might be set to print as white or with no line weight. Go to Page Setup Manager and check your plot style settings—sometimes lines are "there" but told not to print/display based on color.

Also, if you’ve applied a hatch over your lines, it might be covering them visually. Try turning off the hatch temporarily to confirm.

Graphics Card or Regen Issues Are Rarer But Possible

While less common, graphics issues can cause lines not to render correctly.

• Try typing REGEN to force AutoCAD to redraw the screen.
• If that doesn’t help, reset your view or switch between wireframe and shaded visual styles under the View tab.
• On rare occasions, especially with older hardware or drivers, AutoCAD might not display things properly—updating your graphics driver or resetting AutoCAD’s profile might help.

Most of the time, the problem comes down to something simple like layer visibility or viewport display. Before diving into complex troubleshooting, start with these basics:

• Is the correct layer active?
• Are your lines actually drawn where you think they are?
• Have you tried zooming all or regenerating the view?

基本上就這些。 It’s easy to overlook one small setting when you're deep into drafting, but checking these areas usually brings those missing lines back.

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