Can you please share your .blend file?
Fixed it.
While being in edit mode, RMB on your object and choose ‘Bridge Faces’
help 222.blend (834.6 KB)
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oh thank you man ，this is perfect！
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You’re welcome!
Since the problem has been resolved, leave a way to determine the cause when a similar problem occurs.
The reason for the left modeling problem is that the normals direction is reversed during the modeling process.
It’s a common problem and you can check Face Orientation.
Shift+n can be used to straighten it out.
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Thanks friend, very thorough analysis of the principle，this will help me a lot in the furture.
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