OK i have find that I miss! :)
It was "select all edges"!
For me i have understood "all edges" who are "all edges" not merged on my "bottom" face! (so "one edge" of the surface)
:)

Now with selecting all "4 edges" of the surface all works fine! :)

...but maybe my method by kill the surface and redraw by a Sweep with the "3 good edges neighbour" is more speedy...

WOW!! thank you so much guys for all the help and sorry for late replay. i will try everything you did here. really interesting thank you one more time.

快捷键代码：script: /* Select edges v1.4 */ var gd=moi.geometryDatabase, so=gd.getSelectedObjects(); function ss(o,v){o.setProperty("selected",v)} function sl(o){ for ( var i=0; i<o.length; ++i ) o.item(i).getEdges().invertProperty("selected");} gd.selectLoop(); sl(so.getFaces()); sl(so.getSolids()); sl(so.getOpenBReps()); sl(so.getSingleFaceBReps()); ss(so.getBReps(),0); ss(so.getFaces(),0);

环选边，如图1-2和3-4两种选择模式，选择完成后可以合并（JOIN）成曲线，重新构面，就没有破碎的边缘了。

15分钟的事情，构造思路的问题。





仅选中这些面，反选（invert）隐藏（hide）掉其他的一切，并将这些面涂上其他颜色，方便一起选择。

单独加厚（shell）一个面并倒角。




删除背后以及侧面的面，完成。

Hi Suiyan,

Merge and Join are two different things. It sounds like maybe you want Merge rather than Join. There is not a button for Merge. Hit Tab and then type Merge to merge curves.

But, it is usually a bad idea to merge edges of a cube. If you do not like seeing the edges a better way is to hide them by clicking the eye icon like this:



- Peer

谢谢，我知道该怎么做。我的图片所演示的是循环边快捷键的效果（中国的使用者都这么称呼这个命令，意思如图片所演示的，快速选择面的轮廓的所有边缘或一段相连接的所有边缘）。我并不是分不清合并（merge）和连接（join）的区别，而是对于更多段更小的边merge命令的效果并不理想，并不能完全合并成一条边。

我的图片演示是对albehany的情况，将所有细小的边缘连接（join），成为一条曲线，再用网格曲面（network）进行修补会非常顺利。