How to change sa user name in SQLServer

First, run the following code in the query Analyzer of the Enterprise Manager. (Note that the user name used to enter the query analyzer must be System administrator and the database owner of each database ):
Copy codeThe Code is as follows:
Sp_configure 'Allow updates', 1
Go
RECONFIGURE WITH OVERRIDE
Go

Then run the following code:
Copy codeThe Code is as follows:
Update sysxlogins set name = 'the name you want to change to 'where sid = 0x01
Update sysxlogins set sid = 0xE765555BD44F054F89CD0076A06EA823 where name = 'name you want to change to name'

Next:
Copy codeThe Code is as follows:
Sp_configure 'Allow updates', 0
Go
RECONFIGURE WITH OVERRIDE
Go

Then, check the role of SQL SERVER and you will find that the SA user name has been changed to your new name.