1, Article 13 of the Electronic Signature Law:

An electronic signature shall be regarded as reliable if it meets the following conditions:

(1) When the electronic signature production data is used for electronic signature, it belongs to the exclusive rights of the electronic signer;

(2) When signing, the electronic signature production data is only controlled by the electronic signer;

(3) Any changes to the electronic signature after signature can be found;

(4) Any changes to the content and form of the data message after signature can be found. The parties can also choose to use electronic signatures that meet their agreed reliable conditions.

Article 14 A reliable electronic signature has the same legal effect as a handwritten signature or seal.

Therefore, reliable electronic signature and handwritten signature have the same legal effect.

2. After electronic signature, can it be revoked by handwritten signature?

I can't.

Reliable electronic signature and handwritten signature have the same legal effect, and there is no question of which one has higher legal effect. Therefore, if there is no sufficient reason, we can't try to revoke the validity of the electronic signature just because the handwritten signature is more effective than the electronic signature.