I’ve read some of your papers, and I got some questions.
What if I want to change the name-IP mapping? Should I send a transaction to change the zone file? Can this be avoided? As far as I’m concerned, the operation referring underlying blockchain is time consuming.
Is there a way to change the zone file without sending a transaction to be included in a blockchain?
By design, there is not. The zone file is cryptographically linked to your name on the blockchain. If this were not the case, then there would be no reliable way to resolve the name to its zone file.
However, you are not required to use the on-chain zone file 
Instead, you could store a separate zone file to your Gaia node (no transaction required), and then have your resolver look that one up instead.
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Thank you for your reply, solved my problem indeed ：）