Can Mail preserves the mail which had been deleted on the server?

The space in my mail server is limited, so I must delete some mails from the server. But I want to presenve them in the Mail client. How can I do? I cannot find any configuration can do this.

Have no idea what you mean. IMAP or Exchange accounts are server based and messages are always on the server until completely deleted from the trash. Your provider might have an archive feature to preserve emails outside of the main mailboxes on the server, but there are no other settings to delete messages from the server and keep them in the main mailboxes on the computer. Only other option is to move them to local mailboxes.
When you look at IMAP mailboxes, you are only looking at images of what is on the server. When you move or delete a message from a mailbox, the computer sends a message to the server and makes the changes. The changes get relayed back to the computer and you see the change.
You have an option to keep them local for offline viewing, but they will be deleted when deleted from all imap mailboxes.

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