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In the STKO post-processing process, the support of the deformation diagram is disconnected. where problem went wrong？

You probably did nor merge the geometry, please check it.

I merged geometry from the beginning

It's a single Wire, but the edges on top do not pass through the brace-end-node (as you can see here, it is a single edge, not physically intersecting the brace-end-node): What You should do is to delete those edges, draw them again as a 3-point, 2-edge lines passing through the brace end-node, and make the wire again:
Finally, you re-assign material and element properties.
Here is the modified file

Thank you for your detailed explanation. But the deformation pattern is still abnormal.It's not the same as the metamorphosis I had in ETabs.It's been going on for a long time. I can't get the right results.

There were some mistakes in the analysis settings:

• You put both gravity and lateral loads during the gravity analysis. The pushover load should be added after the gravity!
• After the gravity you should use -loadConst (too keep the gravity load constant) and reset the pseudoTime to 0! this is very important in disp-control analysis
• Minor improvement: you are using a single Finite Element per structural member. In this case you need the Force-Based beam element, not the Displacement-Based (which needs a refined mesh)
• You forgot to put the GJ value to the fiber section (it can be singular in torsion)

I also added a monitor to monitor in real-time the pushover curve
Check this: